Merge pull request 'fix(ci): use docker-builder runner for image builds' (#40) from fix/docker-release into main

Reviewed-on: #40

.dockerignore

@@ -1,15 +1,10 @@
 .git
+.ssh/
+.gitea/
 tmp/
 vendor/
-
-# Security: keep sensitive/local files out of Docker build context
-.ssh/
-.claude/
-.github/
-.gitea/
-CLAUDE.md
+*.db
+*.db-journal
 *.local.json
 *.local.md
 *.local
-*.db
-*.db-journal

.gitea/workflows/release.yml

@@ -8,7 +8,13 @@ on:
 jobs:
   release:
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: sh
     steps:
+      - name: Install build tools
+        run: apk add --no-cache git gcc musl-dev
+
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
@@ -34,9 +40,10 @@ jobs:
         env:
           GORELEASER_FORCE_TOKEN: gitea
           GITEA_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+          GITEA_API_URL: http://gitea:3000/api/v1
 
   docker:
-    runs-on: ubuntu-latest
+    runs-on: docker-builder
     needs: [release]
     steps:
       - uses: actions/checkout@v4

.gitignore

@@ -27,7 +27,7 @@ go.work
 # End of https://www.toptal.com/developers/gitignore/api/go
 
 /uptop
-uptop.db
+uptop.db*
 
 .ssh
 

.goreleaser.yaml

@@ -1,12 +1,12 @@
 version: 2
 
 gitea_urls:
-  api: https://gitea.lerkolabs.com/api/v1
+  api: "{{ if index .Env \"GITEA_API_URL\" }}{{ .Env.GITEA_API_URL }}{{ else }}https://gitea.lerkolabs.com/api/v1{{ end }}"
   download: https://gitea.lerkolabs.com
 
 release:
   gitea:
-    owner: lerko
+    owner: lerkolabs
     name: uptop
 
 builds:

CHANGELOG.md

@@ -1,46 +1,94 @@
 # Changelog
 
-## [2026.05.2] — 2026-05-23
+## [2026.05.5] — 2026-05-29
 
 ### Added
-- Comprehensive test suite (94 tests across monitor, server, cluster)
-- golangci-lint config with CI enforcement
-- Gitea Actions CI pipeline (test + lint)
-- Graceful shutdown for HTTP and SSH servers
-- Context-aware alert delivery with timeout
-- Request size limits on all POST endpoints
-- Constant-time secret comparison
-- Check interval jitter to prevent thundering herd
-- `--version` flag with build metadata injection
+- Error reason display when monitors go DOWN (#33)
+- Push monitor lifecycle — PENDING, LATE, DOWN states (#34)
+- Logs tab overhaul — severity tags, filtering, recovery durations (#35)
+- Alert channel health indicator and test alerts (#36)
+- TUI screenshots in `assets/` (#32)
+- CI status badge in README
 
-### Fixed
-- Silent JSON unmarshal failures in alert settings
-- Panic on crypto/rand failure replaced with error return
-- Alert delivery errors now logged instead of swallowed
-- log.Fatalf in goroutines replaced with log.Printf
-- Deprecated LineUp/LineDown API calls
+### Changed
+- Visual polish — detail sections, column headers, alert detail (#37)
+- README rewritten with hero image, badges, collapsible install sections (#32)
+- Changelog rewritten to match actual CalVer tag history
+- Migrated to `lerkolabs` org namespace (#38)
+- Docker-compose files moved to `deploy/`
+
+## [2026.05.4] — 2026-05-27
+
+### Added
+- SSH user seeding from `UPTOP_ADMIN_KEY` env var and `UPTOP_KEYS` file (#31)
+- GoReleaser for binary releases
+- govulncheck in CI pipeline
+- Multi-arch Docker builds (amd64 + arm64)
+
+### Changed
+- CI overhaul — Go 1.26, build caching, streamlined pipeline (#30)
+- Bumped golang.org/x/crypto v0.47.0 → v0.52.0
+- Bumped Alpine 3.21 → 3.23
 
 ### Security
-- Cluster secret compared with crypto/subtle (timing-safe)
-- http.MaxBytesReader on all JSON endpoints
-- ReadHeaderTimeout added to HTTP server
+- Phase 1: SSRF protection, input validation, safe dial (#26)
+- Phase 2: TLS hardening, auth bypass fixes, rate limiting (#27)
+- Phase 3: Graceful degradation, connection limits, timeout enforcement (#28)
+- Phase 4: Code quality, error handling, linter fixes (#29)
 
-## [2026.05.1] — 2026-05-14
+## [2026.05.3] — 2026-05-25
+
+### Added
+- Theme system with 5 dark palettes — Default, Dracula, Nord, Tokyo Night, Gruvbox (#24)
+- `--version` flag with build metadata injection
+- Gitea Actions CI pipeline — test + lint (#20)
+- golangci-lint configuration
+- Comprehensive test suite — 94 tests across monitor, server, cluster (#19)
+- CONTRIBUTING.md and SECURITY.md
+
+### Changed
+- Renamed project from go-upkeep to uptop (#25)
+- Updated LICENSE with dual copyright for independent fork
+
+### Fixed
+- Form validators scoped to relevant monitor types (#23)
+- Graceful shutdown for HTTP, SSH servers and database (#19)
+- Constant-time secret comparison, request size limits (#19)
+- Check interval jitter to prevent thundering herd (#19)
+- TUI visual polish — zebra striping, group icons, sparkline stats (#18)
+
+## [2026.05.2] — 2026-05-22
+
+### Added
+- Incident management and maintenance windows (#17)
+- Production docker-compose.yml
+
+### Fixed
+- Viewport sizing and dynamic chrome calculation (#16)
+- Form height constrained to terminal with resize forwarding
+- Maintenance'd monitors excluded from down count and pulse
+- Group status correctly skips children in maintenance
+
+## [2026.05.1] — 2026-05-16
 
 ### Added
 - Distributed probing with leader + probe nodes
-- Config-as-code (YAML apply/export with dry-run, prune)
-- TUI visual polish (zebra striping, sparklines, breadcrumbs)
-- Incident management and maintenance windows
-- 9 alert providers (Discord, Slack, Email, Ntfy, Telegram, PagerDuty, Pushover, Gotify, Webhook)
+- Config-as-code — YAML apply/export with dry-run and prune
+- TUI polish — status bar, tab badges, detail panel, modals
+- DOWN-first sort, health pulse, site filter
+- Type icons in sites table
+- Sparkline history graphs
+- Persistent state — uptime, status, latency, and logs survive restarts
+- Push token stripping from /status/json response
 
-## [2026.04.1] — Initial independent fork
+## [2026.04.1] — 2026-04-01
 
 ### Added
-- SSH-accessible TUI (Bubble Tea + Wish)
-- 6 check types (HTTP, Push, Ping, Port, DNS, Group)
+- SSH-accessible TUI built on Bubble Tea + Wish
+- 6 check types — HTTP, Push, Ping, Port, DNS, Group
+- 9 alert providers — Discord, Slack, Email, Ntfy, Telegram, PagerDuty, Pushover, Gotify, Webhook
 - SQLite and PostgreSQL support
 - HA clustering with automatic failover
-- Prometheus metrics endpoint
-- Public status page
-- Uptime Kuma import
+- Prometheus /metrics endpoint
+- Public status page (HTML + JSON)
+- Uptime Kuma backup import

README.md

@@ -1,19 +1,50 @@
-# uptop
+<div align="center">
+  <h1>uptop</h1>
+  <p>Self-hosted uptime monitoring with a TUI over SSH.</p>
+  <p>No browser. No client install. Just <code>ssh -p 23234 your-server</code>.</p>
 
-Self-hosted uptime monitor with a TUI you can access over SSH. No browser, no install on the client — just `ssh -p 23234 your-server`.
+  <p>
+    <a href="https://gitea.lerkolabs.com/lerkolabs/uptop/actions/workflows/ci.yml"><img src="https://gitea.lerkolabs.com/lerkolabs/uptop/actions/workflows/ci.yml/badge.svg" alt="CI"></a>
+    <img src="https://img.shields.io/badge/license-MIT-blue" alt="MIT License">
+    <img src="https://img.shields.io/badge/go-1.26-00ADD8?logo=go&logoColor=white" alt="Go 1.26">
+    <img src="https://img.shields.io/docker/pulls/lerkolabs/uptop" alt="Docker Pulls">
+  </p>
 
-Built on the foundation of [RDGames/go-upkeep](https://github.com/RDGames/go-upkeep).
+  <img src="assets/monitors.png" alt="uptop monitors view" width="800">
+</div>
 
-## What it does
+## What is this
 
-- **6 check types**: HTTP, Push (heartbeat), Ping, Port, DNS, Groups
-- **9 alert providers**: Discord, Slack, Email, Ntfy, Webhook, Telegram, PagerDuty, Pushover, Gotify
-- **Config as code**: define monitors in YAML, apply declaratively, version control your setup
-- **HA clustering**: leader/follower with automatic failover
-- **Prometheus metrics**: `/metrics` endpoint for Grafana dashboards
-- **Public status page**: HTML + JSON, toggle with an env var
-- **SQLite or Postgres**: SQLite for single-node, Postgres for production
-- **Uptime Kuma import**: migrate from Kuma with one command
+An uptime monitor you manage entirely from the terminal. It runs as a server, exposes an SSH endpoint, and drops you into a full TUI — monitors, alerts, logs, nodes, all there.
+
+Built on [RDGames/go-upkeep](https://github.com/RDGames/go-upkeep). Rewritten for clustering, config-as-code, and a proper dashboard.
+
+## Features
+
+- **6 check types** — HTTP, Push (heartbeat), Ping, Port, DNS, Groups
+- **9 alert providers** — Discord, Slack, Email, Ntfy, Webhook, Telegram, PagerDuty, Pushover, Gotify
+- **Config as code** — define monitors in YAML, apply declaratively, version control your setup
+- **HA clustering** — leader/follower with automatic failover
+- **Prometheus metrics** — `/metrics` endpoint, wire it straight to Grafana
+- **Public status page** — HTML + JSON, toggle with an env var
+- **SQLite or Postgres** — SQLite for single-node, Postgres for production
+- **Uptime Kuma import** — migrate from Kuma with one command
+
+## Screenshots
+
+<table>
+  <tr>
+    <td><img src="assets/detail.png" alt="detail panel" width="400"></td>
+    <td><img src="assets/alerts.png" alt="alerts view" width="400"></td>
+  </tr>
+  <tr>
+    <td><img src="assets/logs.png" alt="logs view" width="400"></td>
+    <td><img src="assets/nodes.png" alt="cluster nodes" width="400"></td>
+  </tr>
+  <tr>
+    <td colspan="2" align="center"><img src="assets/theme.png" alt="theme selection" width="600"></td>
+  </tr>
+</table>
 
 ## Quick start
 
@@ -22,7 +53,7 @@ go run cmd/uptop/main.go
 ssh -p 23234 localhost
 ```
 
-Seed some demo data to see it in action:
+Want some data to look at first:
 
 ```bash
 go run cmd/uptop/main.go -demo
@@ -30,22 +61,45 @@ go run cmd/uptop/main.go -demo
 
 ## Install
 
-### From source
+<details>
+<summary><strong>Docker (recommended)</strong></summary>
 
-```bash
-go install gitea.lerkolabs.com/lerko/uptop/cmd/uptop@latest
+```yaml
+services:
+  uptop:
+    image: lerkolabs/uptop:latest
+    restart: unless-stopped
+    ports:
+      - "23234:23234"
+      - "8080:8080"
+    environment:
+      - UPTOP_DB_TYPE=sqlite
+      - UPTOP_DB_DSN=/data/uptop.db
+      - UPTOP_STATUS_ENABLED=true
+      # - UPTOP_ADMIN_KEY=ssh-ed25519 AAAA... you@host
+    volumes:
+      - ./data:/data
 ```
 
-### Docker
+First run: set `UPTOP_ADMIN_KEY` to your SSH public key, or attach to the container and add it in the Users tab.
+
+</details>
+
+<details>
+<summary><strong>Binary</strong></summary>
+
+Download from [Releases](https://gitea.lerkolabs.com/lerkolabs/uptop/releases).
+
+</details>
+
+<details>
+<summary><strong>From source</strong></summary>
 
 ```bash
-docker pull lerko/uptop:latest
-docker run -p 23234:23234 -p 8080:8080 -v ./data:/data lerko/uptop
+go install gitea.lerkolabs.com/lerkolabs/uptop/cmd/uptop@latest
 ```
 
-### Binary
-
-Download from [Releases](https://gitea.lerkolabs.com/lerko/uptop/releases).
+</details>
 
 ## Config as code
 
@@ -63,35 +117,11 @@ uptop apply -f monitors.yaml --dry-run   # see what would change
 uptop apply -f monitors.yaml --prune     # delete anything not in the YAML
 ```
 
-See [docs/config-as-code.md](docs/config-as-code.md) for the full reference.
-
-## Docker
-
-```yaml
-services:
-  monitor:
-    build: .
-    restart: unless-stopped
-    stdin_open: true
-    tty: true
-    ports:
-      - "23234:23234"
-      - "8080:8080"
-    volumes:
-      - ./data:/data
-      - ./ssh_keys:/app/.ssh
-    environment:
-      - UPTOP_DB_TYPE=sqlite
-      - UPTOP_DB_DSN=/data/uptop.db
-      - UPTOP_STATUS_ENABLED=true
-      - UPTOP_CLUSTER_SECRET=change-me
-```
-
-First run: attach to the container (`docker attach uptop`), go to the Users tab, add your SSH public key. Then detach with `Ctrl+P, Ctrl+Q` and connect normally over SSH.
+Full reference in [docs/config-as-code.md](docs/config-as-code.md).
 
 ## Environment variables
 
-| Variable | Default | What it does |
+| Variable | Default | Description |
 |---|---|---|
 | `UPTOP_PORT` | `23234` | SSH server port |
 | `UPTOP_HTTP_PORT` | `8080` | HTTP server port (status page, push, metrics) |
@@ -103,6 +133,7 @@ First run: attach to the container (`docker attach uptop`), go to the Users tab,
 | `UPTOP_PEER_URL` | | Leader URL for follower nodes |
 | `UPTOP_CLUSTER_SECRET` | | Shared key for cluster + API auth |
 | `UPTOP_INSECURE_SKIP_VERIFY` | `false` | Skip TLS verification for checks |
+| `UPTOP_ADMIN_KEY` | | SSH public key seeded as first admin on startup |
 
 ## Migrating from Uptime Kuma
 

cmd/uptop/main.go

@@ -17,14 +17,14 @@ import (
 	"syscall"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/cluster"
-	"gitea.lerkolabs.com/lerko/uptop/internal/config"
-	"gitea.lerkolabs.com/lerko/uptop/internal/importer"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
-	"gitea.lerkolabs.com/lerko/uptop/internal/server"
-	"gitea.lerkolabs.com/lerko/uptop/internal/store"
-	"gitea.lerkolabs.com/lerko/uptop/internal/tui"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/cluster"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/config"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/importer"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/server"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/store"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/tui"
 
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/ssh"
@@ -385,6 +385,7 @@ func runServe(args []string) {
 
 	eng.InitHistory()
 	eng.InitLogs()
+	eng.InitAlertHealth()
 	eng.Start(ctx)
 
 	tlsCert := os.Getenv("UPTOP_TLS_CERT")

go.mod

@@ -1,4 +1,4 @@
-module gitea.lerkolabs.com/lerko/uptop
+module gitea.lerkolabs.com/lerkolabs/uptop
 
 go 1.26.3
 

internal/alert/alert.go

@@ -11,7 +11,7 @@ import (
 	"strings"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 )
 
 var alertClient = &http.Client{Timeout: 10 * time.Second}

internal/alert/alert_test.go

@@ -7,7 +7,7 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 )
 
 func TestHTTPProviderDiscord(t *testing.T) {

internal/cluster/cluster.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
 )
 
 type Config struct {

internal/cluster/cluster_test.go

@@ -10,8 +10,8 @@ import (
 	"testing"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
 )
 
 // --- Mock Store (minimal, for monitor.NewEngine) ---
@@ -53,6 +53,10 @@ func (m *mockStore) GetNode(string) (models.ProbeNode, error) { return models.Pr
 func (m *mockStore) GetAllNodes() ([]models.ProbeNode, error) { return nil, nil }
 func (m *mockStore) UpdateNodeLastSeen(string) error          { return nil }
 func (m *mockStore) DeleteNode(string) error                  { return nil }
+func (m *mockStore) LoadAlertHealth() (map[int]models.AlertHealthRecord, error) {
+	return nil, nil
+}
+func (m *mockStore) SaveAlertHealth(models.AlertHealthRecord) error { return nil }
 func (m *mockStore) SaveLog(string) error                           { return nil }
 func (m *mockStore) LoadLogs(int) ([]string, error)                 { return nil, nil }
 func (m *mockStore) GetActiveMaintenanceWindows() ([]models.MaintenanceWindow, error) {
@@ -67,6 +71,8 @@ func (m *mockStore) DeleteMaintenanceWindow(int) error                   { retur
 func (m *mockStore) IsMonitorInMaintenance(int) (bool, error)               { return false, nil }
 func (m *mockStore) GetPreference(string) (string, error)                   { return "", nil }
 func (m *mockStore) SetPreference(string, string) error                     { return nil }
+func (m *mockStore) SaveStateChange(int, string, string, string) error      { return nil }
+func (m *mockStore) GetStateChanges(int, int) ([]models.StateChange, error) { return nil, nil }
 func (m *mockStore) Close() error                                           { return nil }
 
 // --- Cluster Start Tests ---

internal/cluster/probe.go

@@ -12,8 +12,8 @@ import (
 	"sync"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
 )
 
 type ProbeConfig struct {
@@ -130,6 +130,7 @@ type probeResultItem struct {
 	SiteID      int    `json:"site_id"`
 	LatencyNs   int64  `json:"latency_ns"`
 	IsUp        bool   `json:"is_up"`
+	ErrorReason string `json:"error_reason,omitempty"`
 }
 
 func probeExecuteChecks(ctx context.Context, sites []models.Site, strict, insecure *http.Client, allowPrivate bool) []probeResultItem {
@@ -157,6 +158,7 @@ loop:
 				SiteID:      s.ID,
 				LatencyNs:   cr.LatencyNs,
 				IsUp:        cr.Status == "UP",
+				ErrorReason: cr.ErrorReason,
 			})
 			mu.Unlock()
 		}(site)

internal/config/apply.go

@@ -2,8 +2,8 @@ package config
 
 import (
 	"fmt"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/store"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/store"
 	"reflect"
 	"strings"
 )

internal/config/apply_test.go

@@ -1,8 +1,8 @@
 package config
 
 import (
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/store"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/store"
 	"strings"
 	"testing"
 )

internal/config/export.go

@@ -5,8 +5,8 @@ import (
 	"os"
 	"sort"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/store"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/store"
 
 	"gopkg.in/yaml.v3"
 )

internal/config/export_test.go

@@ -1,7 +1,7 @@
 package config
 
 import (
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 	"testing"
 )
 

internal/importer/kuma.go

@@ -3,7 +3,7 @@ package importer
 import (
 	"encoding/json"
 	"fmt"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 	"os"
 	"strings"
 )

internal/metrics/prometheus.go

@@ -2,8 +2,8 @@ package metrics
 
 import (
 	"fmt"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
 	"net/http"
 	"sort"
 	"strings"

internal/metrics/prometheus_test.go

@@ -2,13 +2,14 @@ package metrics
 
 import (
 	"context"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
 	"net/http"
 	"net/http/httptest"
 	"strings"
 	"testing"
 	"time"
+
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
 )
 
 type mockStore struct {
@@ -50,6 +51,10 @@ func (m *mockStore) GetNode(string) (models.ProbeNode, error)         { return m
 func (m *mockStore) GetAllNodes() ([]models.ProbeNode, error)         { return nil, nil }
 func (m *mockStore) UpdateNodeLastSeen(string) error                  { return nil }
 func (m *mockStore) DeleteNode(string) error                          { return nil }
+func (m *mockStore) LoadAlertHealth() (map[int]models.AlertHealthRecord, error) {
+	return nil, nil
+}
+func (m *mockStore) SaveAlertHealth(models.AlertHealthRecord) error { return nil }
 func (m *mockStore) SaveLog(string) error                           { return nil }
 func (m *mockStore) LoadLogs(int) ([]string, error)                 { return nil, nil }
 func (m *mockStore) GetActiveMaintenanceWindows() ([]models.MaintenanceWindow, error) {
@@ -64,6 +69,8 @@ func (m *mockStore) DeleteMaintenanceWindow(int) error                   { retur
 func (m *mockStore) IsMonitorInMaintenance(int) (bool, error)               { return false, nil }
 func (m *mockStore) GetPreference(string) (string, error)                   { return "", nil }
 func (m *mockStore) SetPreference(string, string) error                     { return nil }
+func (m *mockStore) SaveStateChange(int, string, string, string) error      { return nil }
+func (m *mockStore) GetStateChanges(int, int) ([]models.StateChange, error) { return nil, nil }
 func (m *mockStore) Close() error                                           { return nil }
 
 func TestMetricsHandler(t *testing.T) {

internal/models/models.go

@@ -35,6 +35,18 @@ type Site struct {
 	HasSSL          bool
 	LastCheck       time.Time
 	SentSSLWarning  bool
+	LastError       string
+	StatusChangedAt time.Time
+	LastSuccessAt   time.Time
+}
+
+type StateChange struct {
+	ID          int
+	SiteID      int
+	FromStatus  string
+	ToStatus    string
+	ErrorReason string
+	ChangedAt   time.Time
 }
 
 type AlertConfig struct {
@@ -67,6 +79,17 @@ type ProbeNode struct {
 	Version  string
 }
 
+// AlertHealthRecord is the persisted send health of an alert channel. It lets the
+// "last sent" / health indicators survive restarts instead of resetting to "never".
+type AlertHealthRecord struct {
+	AlertID    int
+	LastSendAt time.Time
+	LastSendOK bool
+	LastError  string
+	SendCount  int
+	FailCount  int
+}
+
 type MaintenanceWindow struct {
 	ID          int
 	MonitorID   int

internal/monitor/aggregator.go

@@ -15,6 +15,7 @@ type NodeResult struct {
 	IsUp        bool
 	LatencyNs   int64
 	CheckedAt   time.Time
+	ErrorReason string
 }
 
 func AggregateStatus(results []NodeResult, strategy AggregationStrategy) (isUp bool, avgLatencyNs int64) {

internal/monitor/checker.go

@@ -2,13 +2,14 @@ package monitor
 
 import (
 	"context"
+	"fmt"
 	"net"
 	"net/http"
 	"strconv"
 	"strings"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 
 	"github.com/miekg/dns"
 	probing "github.com/prometheus-community/pro-bing"
@@ -21,6 +22,7 @@ type CheckResult struct {
 	LatencyNs   int64
 	HasSSL      bool
 	CertExpiry  time.Time
+	ErrorReason string
 }
 
 func RunCheck(site models.Site, strict, insecure *http.Client, globalInsecure bool, allowPrivate ...bool) CheckResult {
@@ -35,7 +37,7 @@ func RunCheck(site models.Site, strict, insecure *http.Client, globalInsecure bo
 			if ips, err := net.LookupIP(host); err == nil {
 				for _, ip := range ips {
 					if isPrivateIP(ip) {
-						return CheckResult{SiteID: site.ID, Status: "DOWN"}
+						return CheckResult{SiteID: site.ID, Status: "DOWN", ErrorReason: "target resolves to private IP"}
 					}
 				}
 			}
@@ -52,7 +54,7 @@ func RunCheck(site models.Site, strict, insecure *http.Client, globalInsecure bo
 	case "dns":
 		return runDNSCheck(site)
 	default:
-		return CheckResult{SiteID: site.ID, Status: "DOWN"}
+		return CheckResult{SiteID: site.ID, Status: "DOWN", ErrorReason: "unsupported monitor type: " + site.Type}
 	}
 }
 
@@ -68,7 +70,7 @@ func runHTTPCheck(site models.Site, strict, insecure *http.Client, globalInsecur
 
 	req, err := http.NewRequestWithContext(ctx, method, site.URL, nil)
 	if err != nil {
-		return CheckResult{SiteID: site.ID, Status: "DOWN"}
+		return CheckResult{SiteID: site.ID, Status: "DOWN", ErrorReason: "invalid request: " + err.Error()}
 	}
 
 	client := strict
@@ -88,6 +90,7 @@ func runHTTPCheck(site models.Site, strict, insecure *http.Client, globalInsecur
 
 	if err != nil {
 		result.Status = "DOWN"
+		result.ErrorReason = truncateError(err.Error(), 256)
 		return result
 	}
 	defer resp.Body.Close()
@@ -95,6 +98,11 @@ func runHTTPCheck(site models.Site, strict, insecure *http.Client, globalInsecur
 	result.StatusCode = resp.StatusCode
 	if !isCodeAccepted(resp.StatusCode, site.AcceptedCodes) {
 		result.Status = "DOWN"
+		expected := site.AcceptedCodes
+		if expected == "" {
+			expected = "200-299"
+		}
+		result.ErrorReason = fmt.Sprintf("HTTP %d (expected %s)", resp.StatusCode, expected)
 	}
 
 	if site.CheckSSL && resp.TLS != nil && len(resp.TLS.PeerCertificates) > 0 {
@@ -103,6 +111,7 @@ func runHTTPCheck(site models.Site, strict, insecure *http.Client, globalInsecur
 		result.CertExpiry = cert.NotAfter
 		if time.Now().After(cert.NotAfter) {
 			result.Status = "SSL EXP"
+			result.ErrorReason = "SSL certificate expired"
 		}
 	}
 
@@ -117,7 +126,7 @@ func runPingCheck(site models.Site) CheckResult {
 
 	pinger, err := probing.NewPinger(host)
 	if err != nil {
-		return CheckResult{SiteID: site.ID, Status: "DOWN"}
+		return CheckResult{SiteID: site.ID, Status: "DOWN", ErrorReason: "ping setup: " + err.Error()}
 	}
 	pinger.Count = 1
 	pinger.Timeout = siteTimeout(site)
@@ -127,8 +136,11 @@ func runPingCheck(site models.Site) CheckResult {
 	err = pinger.Run()
 	latency := time.Since(start)
 
-	if err != nil || pinger.Statistics().PacketsRecv == 0 {
-		return CheckResult{SiteID: site.ID, Status: "DOWN", LatencyNs: latency.Nanoseconds()}
+	if err != nil {
+		return CheckResult{SiteID: site.ID, Status: "DOWN", LatencyNs: latency.Nanoseconds(), ErrorReason: "ping failed: " + err.Error()}
+	}
+	if pinger.Statistics().PacketsRecv == 0 {
+		return CheckResult{SiteID: site.ID, Status: "DOWN", LatencyNs: latency.Nanoseconds(), ErrorReason: "no ICMP response"}
 	}
 
 	stats := pinger.Statistics()
@@ -148,7 +160,7 @@ func runPortCheck(site models.Site) CheckResult {
 	latency := time.Since(start)
 
 	if err != nil {
-		return CheckResult{SiteID: site.ID, Status: "DOWN", LatencyNs: latency.Nanoseconds()}
+		return CheckResult{SiteID: site.ID, Status: "DOWN", LatencyNs: latency.Nanoseconds(), ErrorReason: truncateError(err.Error(), 256)}
 	}
 	_ = conn.Close()
 	return CheckResult{SiteID: site.ID, Status: "UP", LatencyNs: latency.Nanoseconds()}
@@ -199,10 +211,10 @@ func runDNSCheck(site models.Site) CheckResult {
 	latency := time.Since(start)
 
 	if err != nil {
-		return CheckResult{SiteID: site.ID, Status: "DOWN", LatencyNs: latency.Nanoseconds()}
+		return CheckResult{SiteID: site.ID, Status: "DOWN", LatencyNs: latency.Nanoseconds(), ErrorReason: "DNS query failed: " + err.Error()}
 	}
 	if r.Rcode != dns.RcodeSuccess {
-		return CheckResult{SiteID: site.ID, Status: "DOWN", StatusCode: r.Rcode, LatencyNs: latency.Nanoseconds()}
+		return CheckResult{SiteID: site.ID, Status: "DOWN", StatusCode: r.Rcode, LatencyNs: latency.Nanoseconds(), ErrorReason: "DNS RCODE: " + dns.RcodeToString[r.Rcode]}
 	}
 	return CheckResult{SiteID: site.ID, Status: "UP", LatencyNs: latency.Nanoseconds()}
 }
@@ -235,3 +247,10 @@ func isCodeAccepted(code int, accepted string) bool {
 	}
 	return false
 }
+
+func truncateError(s string, max int) string {
+	if len(s) <= max {
+		return s
+	}
+	return s[:max-3] + "..."
+}

internal/monitor/checker_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 )
 
 func TestRunCheck_HTTP_Success(t *testing.T) {

internal/monitor/monitor.go

@@ -11,18 +11,26 @@ import (
 	"sync"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/alert"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/store"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/alert"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/store"
 )
 
 const (
 	maxLogEntries    = 100
 	pollInterval     = 5 * time.Second
-	pushGracePeriod  = 5 * time.Second
 	minCheckInterval = 5
+	minPushGrace     = 60 * time.Second
 )
 
+type AlertHealth struct {
+	LastSendAt time.Time
+	LastSendOK bool
+	LastError  string
+	SendCount  int
+	FailCount  int
+}
+
 type Engine struct {
 	mu        sync.RWMutex
 	liveState map[int]models.Site
@@ -42,6 +50,9 @@ type Engine struct {
 	probeResults   map[int]map[string]NodeResult
 	aggStrategy    AggregationStrategy
 
+	alertHealthMu sync.RWMutex
+	alertHealth   map[int]AlertHealth
+
 	db                  store.Store
 	insecureSkipVerify  bool
 	allowPrivateTargets bool
@@ -64,6 +75,7 @@ func newEngine(s store.Store, allowPrivateTargets bool) *Engine {
 		histories:           make(map[int]*SiteHistory),
 		tokenIndex:          make(map[string]int),
 		probeResults:        make(map[int]map[string]NodeResult),
+		alertHealth:         make(map[int]AlertHealth),
 		aggStrategy:         AggAnyDown,
 		isActive:            true,
 		allowPrivateTargets: allowPrivateTargets,
@@ -96,6 +108,19 @@ func sanitizeLog(s string) string {
 	return s
 }
 
+func fmtDurationShort(d time.Duration) string {
+	if d < time.Minute {
+		return fmt.Sprintf("%ds", int(d.Seconds()))
+	}
+	if d < time.Hour {
+		return fmt.Sprintf("%dm", int(d.Minutes()))
+	}
+	if d < 24*time.Hour {
+		return fmt.Sprintf("%dh %dm", int(d.Hours()), int(d.Minutes())%60)
+	}
+	return fmt.Sprintf("%dd %dh", int(d.Hours())/24, int(d.Hours())%24)
+}
+
 func (e *Engine) AddLog(msg string) {
 	e.logMu.Lock()
 	defer e.logMu.Unlock()
@@ -121,6 +146,26 @@ func (e *Engine) InitLogs() {
 	e.logStore = logs
 }
 
+// InitAlertHealth restores persisted alert send health so the dashboard shows real
+// "last sent" / health state on startup instead of resetting every channel to "never".
+func (e *Engine) InitAlertHealth() {
+	records, err := e.db.LoadAlertHealth()
+	if err != nil {
+		return
+	}
+	e.alertHealthMu.Lock()
+	defer e.alertHealthMu.Unlock()
+	for id, r := range records {
+		e.alertHealth[id] = AlertHealth{
+			LastSendAt: r.LastSendAt,
+			LastSendOK: r.LastSendOK,
+			LastError:  r.LastError,
+			SendCount:  r.SendCount,
+			FailCount:  r.FailCount,
+		}
+	}
+}
+
 func (e *Engine) GetLogs() []string {
 	e.logMu.RLock()
 	defer e.logMu.RUnlock()
@@ -186,17 +231,38 @@ func (e *Engine) RecordHeartbeat(token string) bool {
 		return false
 	}
 
+	prevStatus := site.Status
 	site.LastCheck = time.Now()
-	wasDown := site.Status == "DOWN"
 	site.Status = "UP"
 	site.FailureCount = 0
 	site.Latency = 0
+	site.LastError = ""
+	site.LastSuccessAt = time.Now()
+
+	if prevStatus != "UP" {
+		site.StatusChangedAt = time.Now()
+	}
+
 	e.liveState[targetID] = site
 
-	if wasDown {
-		e.AddLog(fmt.Sprintf("Push Monitor '%s' recovered", site.Name))
-		e.triggerAlert(site.AlertID, "✅ RECOVERY", fmt.Sprintf("Push Monitor '%s' is receiving heartbeats.", site.Name))
+	switch prevStatus {
+	case "PENDING":
+		e.AddLog(fmt.Sprintf("Push Monitor '%s' received first heartbeat", site.Name))
+	case "LATE":
+		e.AddLog(fmt.Sprintf("Push Monitor '%s' heartbeat arrived (was late)", site.Name))
+	case "DOWN":
+		downDur := ""
+		if !site.StatusChangedAt.IsZero() {
+			downDur = fmt.Sprintf(" (was down %s)", fmtDurationShort(time.Since(site.StatusChangedAt)))
 		}
+		e.AddLog(fmt.Sprintf("Push Monitor '%s' recovered%s", site.Name, downDur))
+		go e.triggerAlert(site.AlertID, "✅ RECOVERY", fmt.Sprintf("Push Monitor '%s' is receiving heartbeats.%s", site.Name, downDur))
+	}
+
+	if prevStatus != "UP" && prevStatus != "PENDING" {
+		go func() { _ = e.db.SaveStateChange(targetID, prevStatus, "UP", "") }()
+	}
+
 	return true
 }
 
@@ -241,9 +307,6 @@ func (e *Engine) Start(ctx context.Context) {
 				if !exists {
 					e.mu.Lock()
 					s.Status = "PENDING"
-					if s.Type == "push" {
-						s.LastCheck = time.Now()
-					}
 					if h, ok := e.GetHistory(s.ID); ok && len(h.Statuses) > 0 {
 						if h.Statuses[len(h.Statuses)-1] {
 							s.Status = "UP"
@@ -283,6 +346,9 @@ func (e *Engine) UpdateSiteConfig(site models.Site) {
 		site.LastCheck = existing.LastCheck
 		site.SentSSLWarning = existing.SentSSLWarning
 		site.FailureCount = existing.FailureCount
+		site.LastError = existing.LastError
+		site.StatusChangedAt = existing.StatusChangedAt
+		site.LastSuccessAt = existing.LastSuccessAt
 		e.liveState[site.ID] = site
 		e.addToTokenIndex(site)
 	}
@@ -393,33 +459,62 @@ func (e *Engine) checkByID(id int) {
 		updatedSite.CertExpiry = result.CertExpiry
 		updatedSite.Latency = time.Duration(result.LatencyNs)
 		updatedSite.LastCheck = time.Now()
-		e.handleStatusChange(updatedSite, result.Status, result.StatusCode, time.Duration(result.LatencyNs))
+		e.handleStatusChange(updatedSite, result.Status, result.StatusCode, time.Duration(result.LatencyNs), result.ErrorReason)
 	}
 }
 
 func (e *Engine) checkPush(site models.Site) {
-	deadline := site.LastCheck.Add(time.Duration(site.Interval) * time.Second).Add(pushGracePeriod)
-	if time.Now().After(deadline) {
-		e.handleStatusChange(site, "DOWN", 0, 0)
-	} else if site.Status != "UP" {
-		e.handleStatusChange(site, "UP", 200, 0)
+	if site.Status == "PENDING" {
+		return
+	}
+
+	interval := time.Duration(site.Interval) * time.Second
+	grace := interval / 2
+	if grace < minPushGrace {
+		grace = minPushGrace
+	}
+
+	overdue := site.LastCheck.Add(interval)
+	graceEnd := overdue.Add(grace)
+	now := time.Now()
+
+	if now.After(graceEnd) {
+		if site.Status != "DOWN" {
+			e.handleStatusChange(site, "DOWN", 0, 0, "heartbeat missed")
+		}
+	} else if now.After(overdue) {
+		if site.Status != "LATE" {
+			e.handleStatusChange(site, "LATE", 0, 0, "heartbeat overdue")
+		}
 	}
 }
 
-func (e *Engine) handleStatusChange(site models.Site, rawStatus string, code int, latency time.Duration) {
+func (e *Engine) handleStatusChange(site models.Site, rawStatus string, code int, latency time.Duration, errorReason string) {
 	if !e.IsActive() {
 		return
 	}
 
 	newState := site
 	newState.StatusCode = code
+	newState.LastError = errorReason
+
+	if rawStatus == "UP" {
+		newState.LastSuccessAt = time.Now()
+		newState.LastError = ""
+	} else {
+		newState.LastSuccessAt = site.LastSuccessAt
+	}
 
 	if site.Status == "UP" && rawStatus != "UP" {
 		newState.FailureCount++
 		if newState.FailureCount > site.MaxRetries {
 			newState.Status = rawStatus
 			newState.FailureCount = site.MaxRetries + 1
+			if errorReason != "" {
+				e.AddLog(fmt.Sprintf("Monitor '%s' confirmed DOWN: %s", site.Name, errorReason))
+			} else {
 				e.AddLog(fmt.Sprintf("Monitor '%s' confirmed DOWN", site.Name))
+			}
 		} else {
 			e.AddLog(fmt.Sprintf("Monitor '%s' failed check %d/%d", site.Name, newState.FailureCount, site.MaxRetries))
 		}
@@ -431,6 +526,14 @@ func (e *Engine) handleStatusChange(site models.Site, rawStatus string, code int
 		newState.FailureCount = site.MaxRetries + 1
 	}
 
+	if newState.Status != site.Status && site.Status != "PENDING" {
+		newState.StatusChangedAt = time.Now()
+	} else if site.StatusChangedAt.IsZero() && newState.Status != "PENDING" {
+		newState.StatusChangedAt = time.Now()
+	} else {
+		newState.StatusChangedAt = site.StatusChangedAt
+	}
+
 	inMaint := e.isInMaintenance(site.ID)
 
 	if site.Type == "http" && site.CheckSSL && site.HasSSL {
@@ -455,12 +558,24 @@ func (e *Engine) handleStatusChange(site models.Site, rawStatus string, code int
 
 	e.recordCheck(site.ID, latency, rawStatus == "UP")
 
+	if newState.Status != site.Status && site.Status != "PENDING" {
+		go func() { _ = e.db.SaveStateChange(site.ID, site.Status, newState.Status, errorReason) }()
+	}
+
 	isBroken := func(s string) bool { return s == "DOWN" || s == "SSL EXP" }
+
+	if site.Status == "UP" && newState.Status == "LATE" {
+		e.AddLog(fmt.Sprintf("Monitor '%s' heartbeat overdue", site.Name))
+	}
+
 	if !isBroken(site.Status) && isBroken(newState.Status) && newState.Status != "PENDING" {
 		if inMaint {
 			e.AddLog(fmt.Sprintf("Monitor '%s' is DOWN (alerts suppressed — maintenance)", site.Name))
 		} else {
 			msg := fmt.Sprintf("Monitor '%s' is DOWN (%s)", site.Name, rawStatus)
+			if errorReason != "" {
+				msg = fmt.Sprintf("Monitor '%s' is DOWN: %s", site.Name, errorReason)
+			}
 			if site.Type == "push" {
 				msg = fmt.Sprintf("Push Monitor '%s' missed heartbeat.", site.Name)
 			}
@@ -468,11 +583,17 @@ func (e *Engine) handleStatusChange(site models.Site, rawStatus string, code int
 		}
 	}
 	if isBroken(site.Status) && newState.Status == "UP" {
-		if !inMaint {
-			e.triggerAlert(site.AlertID, "✅ RECOVERY", fmt.Sprintf("Monitor '%s' is UP", site.Name))
-		} else {
-			e.AddLog(fmt.Sprintf("Monitor '%s' recovered (maintenance active, alert suppressed)", site.Name))
+		downDur := ""
+		if !site.StatusChangedAt.IsZero() {
+			downDur = fmt.Sprintf(" (was down %s)", fmtDurationShort(time.Since(site.StatusChangedAt)))
 		}
+		e.AddLog(fmt.Sprintf("Monitor '%s' recovered%s", site.Name, downDur))
+		if !inMaint {
+			e.triggerAlert(site.AlertID, "✅ RECOVERY", fmt.Sprintf("Monitor '%s' is UP%s", site.Name, downDur))
+		}
+	}
+	if site.Status == "LATE" && newState.Status == "UP" && !isBroken(site.Status) {
+		e.AddLog(fmt.Sprintf("Monitor '%s' heartbeat arrived (was late)", site.Name))
 	}
 }
 
@@ -489,11 +610,69 @@ func (e *Engine) triggerAlert(alertID int, title, message string) {
 			defer cancel()
 			if err := provider.Send(ctx, title, message); err != nil {
 				e.AddLog(fmt.Sprintf("Alert send failed (%s): %v", cfg.Name, err))
+				e.recordAlertResult(alertID, false, err.Error())
+			} else {
+				e.recordAlertResult(alertID, true, "")
 			}
 		}()
 	}
 }
 
+func (e *Engine) recordAlertResult(alertID int, ok bool, errMsg string) {
+	e.alertHealthMu.Lock()
+	defer e.alertHealthMu.Unlock()
+	h := e.alertHealth[alertID]
+	h.LastSendAt = time.Now()
+	h.LastSendOK = ok
+	h.SendCount++
+	if ok {
+		h.LastError = ""
+	} else {
+		h.LastError = errMsg
+		h.FailCount++
+	}
+	e.alertHealth[alertID] = h
+
+	// Persist best-effort so health survives restarts; DB IO off the alert path.
+	go func(rec models.AlertHealthRecord) {
+		_ = e.db.SaveAlertHealth(rec)
+	}(models.AlertHealthRecord{
+		AlertID:    alertID,
+		LastSendAt: h.LastSendAt,
+		LastSendOK: h.LastSendOK,
+		LastError:  h.LastError,
+		SendCount:  h.SendCount,
+		FailCount:  h.FailCount,
+	})
+}
+
+func (e *Engine) GetAlertHealth(alertID int) AlertHealth {
+	e.alertHealthMu.RLock()
+	defer e.alertHealthMu.RUnlock()
+	return e.alertHealth[alertID]
+}
+
+func (e *Engine) TestAlert(alertID int) error {
+	cfg, err := e.db.GetAlert(alertID)
+	if err != nil {
+		return fmt.Errorf("failed to load alert: %w", err)
+	}
+	provider := alert.GetProvider(cfg)
+	if provider == nil {
+		return fmt.Errorf("no provider for type %q", cfg.Type)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+	err = provider.Send(ctx, "🧪 Test Alert", fmt.Sprintf("Test notification from uptop for channel '%s'.", cfg.Name))
+	if err != nil {
+		e.recordAlertResult(alertID, false, err.Error())
+		return err
+	}
+	e.recordAlertResult(alertID, true, "")
+	e.AddLog(fmt.Sprintf("Test alert sent to '%s'", cfg.Name))
+	return nil
+}
+
 func (e *Engine) isInMaintenance(monitorID int) bool {
 	inMaint, err := e.db.IsMonitorInMaintenance(monitorID)
 	if err != nil {
@@ -554,7 +733,7 @@ func (e *Engine) SetAggStrategy(strategy AggregationStrategy) {
 	e.aggStrategy = strategy
 }
 
-func (e *Engine) IngestProbeResult(nodeID string, siteID int, latencyNs int64, isUp bool) {
+func (e *Engine) IngestProbeResult(nodeID string, siteID int, latencyNs int64, isUp bool, errorReason string) {
 	e.probeResultsMu.Lock()
 	if e.probeResults[siteID] == nil {
 		e.probeResults[siteID] = make(map[string]NodeResult)
@@ -564,6 +743,7 @@ func (e *Engine) IngestProbeResult(nodeID string, siteID int, latencyNs int64, i
 		IsUp:        isUp,
 		LatencyNs:   latencyNs,
 		CheckedAt:   time.Now(),
+		ErrorReason: errorReason,
 	}
 	results := make([]NodeResult, 0, len(e.probeResults[siteID]))
 	for _, r := range e.probeResults[siteID] {
@@ -588,7 +768,7 @@ func (e *Engine) IngestProbeResult(nodeID string, siteID int, latencyNs int64, i
 	updatedSite := site
 	updatedSite.Latency = time.Duration(avgLatency)
 	updatedSite.LastCheck = time.Now()
-	e.handleStatusChange(updatedSite, rawStatus, 0, time.Duration(avgLatency))
+	e.handleStatusChange(updatedSite, rawStatus, 0, time.Duration(avgLatency), errorReason)
 }
 
 func (e *Engine) GetProbeResults(siteID int) map[string]NodeResult {
@@ -601,3 +781,11 @@ func (e *Engine) GetProbeResults(siteID int) map[string]NodeResult {
 	}
 	return cp
 }
+
+func (e *Engine) GetStateChanges(siteID int, limit int) []models.StateChange {
+	changes, err := e.db.GetStateChanges(siteID, limit)
+	if err != nil {
+		return nil
+	}
+	return changes
+}

internal/monitor/monitor_test.go

@@ -2,10 +2,11 @@ package monitor
 
 import (
 	"fmt"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
 	"sync"
 	"testing"
 	"time"
+
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 )
 
 // --- Mock Store ---
@@ -62,6 +63,10 @@ func (m *mockStore) GetNode(string) (models.ProbeNode, error)         { return m
 func (m *mockStore) GetAllNodes() ([]models.ProbeNode, error)         { return nil, nil }
 func (m *mockStore) UpdateNodeLastSeen(string) error                  { return nil }
 func (m *mockStore) DeleteNode(string) error                          { return nil }
+func (m *mockStore) LoadAlertHealth() (map[int]models.AlertHealthRecord, error) {
+	return nil, nil
+}
+func (m *mockStore) SaveAlertHealth(models.AlertHealthRecord) error { return nil }
 func (m *mockStore) GetActiveMaintenanceWindows() ([]models.MaintenanceWindow, error) {
 	return nil, nil
 }
@@ -73,6 +78,8 @@ func (m *mockStore) EndMaintenanceWindow(int) error                      { retur
 func (m *mockStore) DeleteMaintenanceWindow(int) error                      { return nil }
 func (m *mockStore) GetPreference(string) (string, error)                   { return "", nil }
 func (m *mockStore) SetPreference(string, string) error                     { return nil }
+func (m *mockStore) SaveStateChange(int, string, string, string) error      { return nil }
+func (m *mockStore) GetStateChanges(int, int) ([]models.StateChange, error) { return nil, nil }
 func (m *mockStore) Close() error                                           { return nil }
 
 func (m *mockStore) GetAllAlerts() ([]models.AlertConfig, error) {
@@ -174,7 +181,7 @@ func TestHandleStatusChange_PendingToUp(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "PENDING", MaxRetries: 3, AlertID: 1}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "UP", 200, 10*time.Millisecond)
+	e.handleStatusChange(site, "UP", 200, 10*time.Millisecond, "")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "UP" {
@@ -195,7 +202,7 @@ func TestHandleStatusChange_UpIncrementFailure(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "UP", MaxRetries: 3, FailureCount: 0}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "DOWN", 500, 0)
+	e.handleStatusChange(site, "DOWN", 500, 0, "test error")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "UP" {
@@ -213,7 +220,7 @@ func TestHandleStatusChange_UpToDown_ExceedsRetries(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "UP", MaxRetries: 2, FailureCount: 2, AlertID: 1}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "DOWN", 500, 0)
+	e.handleStatusChange(site, "DOWN", 500, 0, "test error")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "DOWN" {
@@ -236,7 +243,7 @@ func TestHandleStatusChange_UpToDown_ZeroRetries(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "UP", MaxRetries: 0, FailureCount: 0, AlertID: 1}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "DOWN", 0, 0)
+	e.handleStatusChange(site, "DOWN", 0, 0, "test error")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "DOWN" {
@@ -255,7 +262,7 @@ func TestHandleStatusChange_DownToUp_Recovery(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "DOWN", FailureCount: 4, AlertID: 1}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "UP", 200, 5*time.Millisecond)
+	e.handleStatusChange(site, "UP", 200, 5*time.Millisecond, "")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "UP" {
@@ -276,7 +283,7 @@ func TestHandleStatusChange_DownStaysDown(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "DOWN", MaxRetries: 2, FailureCount: 3}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "DOWN", 0, 0)
+	e.handleStatusChange(site, "DOWN", 0, 0, "test error")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "DOWN" {
@@ -295,7 +302,7 @@ func TestHandleStatusChange_SSLExpired(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "UP", MaxRetries: 0, AlertID: 1}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "SSL EXP", 0, 0)
+	e.handleStatusChange(site, "SSL EXP", 0, 0, "SSL certificate expired")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "SSL EXP" {
@@ -315,7 +322,7 @@ func TestHandleStatusChange_AlertSuppressedMaintenance(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "UP", MaxRetries: 0, AlertID: 1}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "DOWN", 0, 0)
+	e.handleStatusChange(site, "DOWN", 0, 0, "test error")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "DOWN" {
@@ -346,7 +353,7 @@ func TestHandleStatusChange_RecoverySuppressedMaintenance(t *testing.T) {
 	site := models.Site{ID: 1, Name: "test", Status: "DOWN", AlertID: 1}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "UP", 200, 0)
+	e.handleStatusChange(site, "UP", 200, 0, "")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "UP" {
@@ -370,7 +377,7 @@ func TestHandleStatusChange_SSLWarning(t *testing.T) {
 	}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "UP", 200, 0)
+	e.handleStatusChange(site, "UP", 200, 0, "")
 
 	s, _ := getSite(e, 1)
 	if !s.SentSSLWarning {
@@ -393,7 +400,7 @@ func TestHandleStatusChange_SSLWarningNotRepeated(t *testing.T) {
 	}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "UP", 200, 0)
+	e.handleStatusChange(site, "UP", 200, 0, "")
 
 	waitAsync()
 	if len(ms.getAlertCallsSnapshot()) != 0 {
@@ -412,7 +419,7 @@ func TestHandleStatusChange_SSLWarningReset(t *testing.T) {
 	}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "UP", 200, 0)
+	e.handleStatusChange(site, "UP", 200, 0, "")
 
 	s, _ := getSite(e, 1)
 	if s.SentSSLWarning {
@@ -433,7 +440,7 @@ func TestHandleStatusChange_SSLWarningSuppressedMaint(t *testing.T) {
 	}
 	injectSite(e, site)
 
-	e.handleStatusChange(site, "UP", 200, 0)
+	e.handleStatusChange(site, "UP", 200, 0, "")
 
 	s, _ := getSite(e, 1)
 	if !s.SentSSLWarning {
@@ -452,7 +459,7 @@ func TestHandleStatusChange_InactiveEngine(t *testing.T) {
 	injectSite(e, site)
 	e.SetActive(false)
 
-	e.handleStatusChange(site, "DOWN", 0, 0)
+	e.handleStatusChange(site, "DOWN", 0, 0, "test error")
 
 	s, _ := getSite(e, 1)
 	if s.Status != "UP" {
@@ -534,7 +541,7 @@ func TestCheckPush_DeadlineMissed(t *testing.T) {
 	site := models.Site{
 		ID: 1, Name: "push", Type: "push", Status: "UP",
 		Interval: 10, MaxRetries: 0,
-		LastCheck: time.Now().Add(-20 * time.Second),
+		LastCheck: time.Now().Add(-120 * time.Second),
 	}
 	injectSite(e, site)
 
@@ -546,6 +553,24 @@ func TestCheckPush_DeadlineMissed(t *testing.T) {
 	}
 }
 
+func TestCheckPush_OverdueBecomesLate(t *testing.T) {
+	ms := newMockStore()
+	e := newTestEngine(ms)
+	site := models.Site{
+		ID: 1, Name: "push", Type: "push", Status: "UP",
+		Interval:  300,
+		LastCheck: time.Now().Add(-310 * time.Second),
+	}
+	injectSite(e, site)
+
+	e.checkPush(site)
+
+	s, _ := getSite(e, 1)
+	if s.Status != "LATE" {
+		t.Errorf("expected LATE when overdue but within grace, got %s", s.Status)
+	}
+}
+
 func TestCheckPush_WithinDeadline(t *testing.T) {
 	ms := newMockStore()
 	e := newTestEngine(ms)
@@ -563,20 +588,20 @@ func TestCheckPush_WithinDeadline(t *testing.T) {
 	}
 }
 
-func TestCheckPush_PendingToUp(t *testing.T) {
+func TestCheckPush_PendingStaysPending(t *testing.T) {
 	ms := newMockStore()
 	e := newTestEngine(ms)
 	site := models.Site{
 		ID: 1, Name: "push", Type: "push", Status: "PENDING",
-		Interval: 60, LastCheck: time.Now(),
+		Interval: 60,
 	}
 	injectSite(e, site)
 
 	e.checkPush(site)
 
 	s, _ := getSite(e, 1)
-	if s.Status != "UP" {
-		t.Errorf("expected UP, got %s", s.Status)
+	if s.Status != "PENDING" {
+		t.Errorf("expected PENDING to stay until first heartbeat, got %s", s.Status)
 	}
 }
 
@@ -991,7 +1016,7 @@ func TestConcurrent_HandleStatusChangeAndGetState(t *testing.T) {
 		wg.Add(2)
 		go func() {
 			defer wg.Done()
-			e.handleStatusChange(site, "DOWN", 500, 0)
+			e.handleStatusChange(site, "DOWN", 500, 0, "test error")
 		}()
 		go func() {
 			defer wg.Done()

internal/server/server.go

@@ -11,11 +11,11 @@ import (
 	"strings"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/importer"
-	"gitea.lerkolabs.com/lerko/uptop/internal/metrics"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
-	"gitea.lerkolabs.com/lerko/uptop/internal/store"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/importer"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/metrics"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/store"
 )
 
 const maxRequestBody = 1 << 20
@@ -67,6 +67,7 @@ var statusTpl = template.Must(template.New("status").Parse(`
 		.UP { background: #9ece6a; color: #1a1b26; }
 		.DOWN { background: #f7768e; color: #1a1b26; }
 		.PENDING { background: #e0af68; color: #1a1b26; }
+		.LATE { background: #e0af68; color: #1a1b26; }
 		.SSL-EXP { background: #e0af68; color: #1a1b26; }
 		.PAUSED { background: #565f89; color: #c0caf5; }
 		.MAINT { background: #bb9af7; color: #1a1b26; }
@@ -406,6 +407,7 @@ func Start(cfg ServerConfig, s store.Store, eng *monitor.Engine) *http.Server {
 				SiteID      int    `json:"site_id"`
 				LatencyNs   int64  `json:"latency_ns"`
 				IsUp        bool   `json:"is_up"`
+				ErrorReason string `json:"error_reason"`
 			} `json:"results"`
 		}
 		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -420,7 +422,7 @@ func Start(cfg ServerConfig, s store.Store, eng *monitor.Engine) *http.Server {
 			if err := s.SaveCheckFromNode(result.SiteID, req.NodeID, result.LatencyNs, result.IsUp); err != nil {
 				log.Printf("Failed to save probe result: %v", err)
 			}
-			eng.IngestProbeResult(req.NodeID, result.SiteID, result.LatencyNs, result.IsUp)
+			eng.IngestProbeResult(req.NodeID, result.SiteID, result.LatencyNs, result.IsUp, result.ErrorReason)
 		}
 		if err := s.UpdateNodeLastSeen(req.NodeID); err != nil {
 			log.Printf("Failed to update node last seen: %v", err)

internal/server/server_test.go

@@ -4,13 +4,14 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
 	"net"
 	"net/http"
 	"sync"
 	"testing"
 	"time"
+
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
 )
 
 // --- Mock Store ---
@@ -64,6 +65,10 @@ func (m *mockStore) AddAlertReturningID(string, string, map[string]string) (int,
 func (m *mockStore) GetAllNodes() ([]models.ProbeNode, error) { return nil, nil }
 func (m *mockStore) UpdateNodeLastSeen(string) error          { return nil }
 func (m *mockStore) DeleteNode(string) error                  { return nil }
+func (m *mockStore) LoadAlertHealth() (map[int]models.AlertHealthRecord, error) {
+	return nil, nil
+}
+func (m *mockStore) SaveAlertHealth(models.AlertHealthRecord) error { return nil }
 func (m *mockStore) SaveLog(string) error                           { return nil }
 func (m *mockStore) LoadLogs(int) ([]string, error)                 { return nil, nil }
 func (m *mockStore) GetAllMaintenanceWindows(int) ([]models.MaintenanceWindow, error) {
@@ -75,6 +80,8 @@ func (m *mockStore) DeleteMaintenanceWindow(int) error                   { retur
 func (m *mockStore) IsMonitorInMaintenance(int) (bool, error)               { return false, nil }
 func (m *mockStore) GetPreference(string) (string, error)                   { return "", nil }
 func (m *mockStore) SetPreference(string, string) error                     { return nil }
+func (m *mockStore) SaveStateChange(int, string, string, string) error      { return nil }
+func (m *mockStore) GetStateChanges(int, int) ([]models.StateChange, error) { return nil, nil }
 func (m *mockStore) Close() error                                           { return nil }
 
 func (m *mockStore) ExportData() (models.Backup, error) {

internal/store/dialect.go

@@ -14,6 +14,7 @@ type Dialect interface {
 	ImportWipe(tx *sql.Tx)
 	ImportResetSequences(tx *sql.Tx)
 	UpsertNodeSQL() string
+	UpsertAlertHealthSQL() string
 }
 
 func rewritePlaceholders(query string, dollarStyle bool) string {

internal/store/postgres.go

@@ -72,6 +72,23 @@ func (d *PostgresDialect) CreateTablesSQL() []string {
 			key TEXT PRIMARY KEY,
 			value TEXT NOT NULL
 		)`,
+		`CREATE TABLE IF NOT EXISTS state_changes (
+			id SERIAL PRIMARY KEY,
+			site_id INTEGER NOT NULL,
+			from_status TEXT NOT NULL,
+			to_status TEXT NOT NULL,
+			error_reason TEXT DEFAULT '',
+			changed_at TIMESTAMP DEFAULT NOW()
+		)`,
+		`CREATE INDEX IF NOT EXISTS idx_state_changes_site ON state_changes(site_id, changed_at DESC)`,
+		`CREATE TABLE IF NOT EXISTS alert_health (
+			alert_id INTEGER PRIMARY KEY,
+			last_send_at TIMESTAMP,
+			last_send_ok BOOLEAN DEFAULT FALSE,
+			last_error TEXT DEFAULT '',
+			send_count INTEGER DEFAULT 0,
+			fail_count INTEGER DEFAULT 0
+		)`,
 	}
 }
 
@@ -97,6 +114,10 @@ func (d *PostgresDialect) UpsertNodeSQL() string {
 	return "INSERT INTO nodes (id, name, region, last_seen, version) VALUES ($1, $2, $3, NOW(), $4) ON CONFLICT (id) DO UPDATE SET name = EXCLUDED.name, region = EXCLUDED.region, last_seen = NOW(), version = EXCLUDED.version"
 }
 
+func (d *PostgresDialect) UpsertAlertHealthSQL() string {
+	return "INSERT INTO alert_health (alert_id, last_send_at, last_send_ok, last_error, send_count, fail_count) VALUES ($1, $2, $3, $4, $5, $6) ON CONFLICT (alert_id) DO UPDATE SET last_send_at = EXCLUDED.last_send_at, last_send_ok = EXCLUDED.last_send_ok, last_error = EXCLUDED.last_error, send_count = EXCLUDED.send_count, fail_count = EXCLUDED.fail_count"
+}
+
 func (d *PostgresDialect) ResetSequenceOnEmpty(db *sql.DB, table string) {}
 
 func (d *PostgresDialect) ImportWipe(tx *sql.Tx) {

internal/store/sqlite.go

@@ -79,6 +79,23 @@ func (d *SQLiteDialect) CreateTablesSQL() []string {
 			key TEXT PRIMARY KEY,
 			value TEXT NOT NULL
 		)`,
+		`CREATE TABLE IF NOT EXISTS state_changes (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			site_id INTEGER NOT NULL,
+			from_status TEXT NOT NULL,
+			to_status TEXT NOT NULL,
+			error_reason TEXT DEFAULT '',
+			changed_at DATETIME DEFAULT CURRENT_TIMESTAMP
+		)`,
+		`CREATE INDEX IF NOT EXISTS idx_state_changes_site ON state_changes(site_id, changed_at DESC)`,
+		`CREATE TABLE IF NOT EXISTS alert_health (
+			alert_id INTEGER PRIMARY KEY,
+			last_send_at DATETIME,
+			last_send_ok BOOLEAN DEFAULT 0,
+			last_error TEXT DEFAULT '',
+			send_count INTEGER DEFAULT 0,
+			fail_count INTEGER DEFAULT 0
+		)`,
 	}
 }
 
@@ -104,6 +121,10 @@ func (d *SQLiteDialect) UpsertNodeSQL() string {
 	return "INSERT OR REPLACE INTO nodes (id, name, region, last_seen, version) VALUES (?, ?, ?, CURRENT_TIMESTAMP, ?)"
 }
 
+func (d *SQLiteDialect) UpsertAlertHealthSQL() string {
+	return "INSERT OR REPLACE INTO alert_health (alert_id, last_send_at, last_send_ok, last_error, send_count, fail_count) VALUES (?, ?, ?, ?, ?, ?)"
+}
+
 func (d *SQLiteDialect) ResetSequenceOnEmpty(db *sql.DB, table string) {
 	var count int
 	_ = db.QueryRow("SELECT COUNT(*) FROM " + table).Scan(&count) //nolint:errcheck

internal/store/sqlstore.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 )
 
 const (
@@ -347,6 +347,29 @@ func (s *SQLStore) DeleteUser(id int) error {
 	return err
 }
 
+func (s *SQLStore) SaveStateChange(siteID int, fromStatus, toStatus, errorReason string) error {
+	_, err := s.db.Exec(s.q("INSERT INTO state_changes (site_id, from_status, to_status, error_reason) VALUES (?, ?, ?, ?)"),
+		siteID, fromStatus, toStatus, errorReason)
+	return err
+}
+
+func (s *SQLStore) GetStateChanges(siteID int, limit int) ([]models.StateChange, error) {
+	rows, err := s.db.Query(s.q("SELECT id, site_id, from_status, to_status, error_reason, changed_at FROM state_changes WHERE site_id = ? ORDER BY changed_at DESC LIMIT ?"), siteID, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var changes []models.StateChange
+	for rows.Next() {
+		var sc models.StateChange
+		if err := rows.Scan(&sc.ID, &sc.SiteID, &sc.FromStatus, &sc.ToStatus, &sc.ErrorReason, &sc.ChangedAt); err != nil {
+			return changes, err
+		}
+		changes = append(changes, sc)
+	}
+	return changes, rows.Err()
+}
+
 func (s *SQLStore) SaveCheck(siteID int, latencyNs int64, isUp bool) error {
 	return s.SaveCheckFromNode(siteID, "", latencyNs, isUp)
 }
@@ -407,6 +430,37 @@ func (s *SQLStore) DeleteNode(id string) error {
 	return err
 }
 
+func (s *SQLStore) LoadAlertHealth() (map[int]models.AlertHealthRecord, error) {
+	rows, err := s.db.Query("SELECT alert_id, last_send_at, last_send_ok, last_error, send_count, fail_count FROM alert_health")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make(map[int]models.AlertHealthRecord)
+	for rows.Next() {
+		var r models.AlertHealthRecord
+		var lastSend sql.NullTime
+		if err := rows.Scan(&r.AlertID, &lastSend, &r.LastSendOK, &r.LastError, &r.SendCount, &r.FailCount); err != nil {
+			return out, err
+		}
+		if lastSend.Valid {
+			r.LastSendAt = lastSend.Time
+		}
+		out[r.AlertID] = r
+	}
+	return out, rows.Err()
+}
+
+func (s *SQLStore) SaveAlertHealth(h models.AlertHealthRecord) error {
+	var lastSend interface{}
+	if !h.LastSendAt.IsZero() {
+		lastSend = h.LastSendAt
+	}
+	_, err := s.db.Exec(s.dialect.UpsertAlertHealthSQL(),
+		h.AlertID, lastSend, h.LastSendOK, h.LastError, h.SendCount, h.FailCount)
+	return err
+}
+
 func (s *SQLStore) SaveLog(message string) error {
 	_, err := s.db.Exec(s.q("INSERT INTO logs (message) VALUES (?)"), message)
 	if err != nil {

internal/store/sqlstore_test.go

@@ -1,7 +1,7 @@
 package store
 
 import (
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 	"testing"
 )
 

internal/store/store.go

@@ -1,7 +1,7 @@
 package store
 
 import (
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 )
 
 type Store interface {
@@ -38,6 +38,10 @@ type Store interface {
 	SaveCheckFromNode(siteID int, nodeID string, latencyNs int64, isUp bool) error
 	LoadAllHistory(limit int) (map[int][]models.CheckRecord, error)
 
+	// State Changes
+	SaveStateChange(siteID int, fromStatus, toStatus, errorReason string) error
+	GetStateChanges(siteID int, limit int) ([]models.StateChange, error)
+
 	// Nodes
 	RegisterNode(node models.ProbeNode) error
 	GetNode(id string) (models.ProbeNode, error)
@@ -45,6 +49,10 @@ type Store interface {
 	UpdateNodeLastSeen(id string) error
 	DeleteNode(id string) error
 
+	// Alert Health
+	LoadAlertHealth() (map[int]models.AlertHealthRecord, error)
+	SaveAlertHealth(h models.AlertHealthRecord) error
+
 	// Logs
 	SaveLog(message string) error
 	LoadLogs(limit int) ([]string, error)

internal/tui/tab_alerts.go

@@ -2,7 +2,10 @@ package tui
 
 import (
 	"fmt"
+	"strings"
+	"time"
 
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/huh"
 	"github.com/charmbracelet/lipgloss"
@@ -113,34 +116,122 @@ func fmtAlertConfig(alert struct {
 	}
 }
 
+func fmtAlertHealth(h monitor.AlertHealth) string {
+	if h.LastSendAt.IsZero() {
+		return subtleStyle.Render("●")
+	}
+	if h.LastSendOK {
+		return specialStyle.Render("●")
+	}
+	return dangerStyle.Render("●")
+}
+
+func fmtAlertLastSent(h monitor.AlertHealth) string {
+	if h.LastSendAt.IsZero() {
+		return subtleStyle.Render("never")
+	}
+	d := time.Since(h.LastSendAt)
+	if d < time.Minute {
+		return fmt.Sprintf("%ds ago", int(d.Seconds()))
+	}
+	if d < time.Hour {
+		return fmt.Sprintf("%dm ago", int(d.Minutes()))
+	}
+	if d < 24*time.Hour {
+		return fmt.Sprintf("%dh ago", int(d.Hours()))
+	}
+	return fmt.Sprintf("%dd ago", int(d.Hours())/24)
+}
+
 func (m Model) viewAlertsTab() string {
 	if len(m.alerts) == 0 {
 		return "\n  No alert channels configured. Press [n] to add one."
 	}
 
+	var headers []string
+	var widths []int
+	if m.isWide() {
+		headers = []string{"#", "", "NAME", "TYPE", "CONFIG", "LAST SENT"}
+		widths = []int{4, 3, 18, 12, 40, 12}
+	} else {
+		headers = []string{"#", "", "NAME", "TYPE", "CONFIG", "SENT"}
+		widths = []int{4, 3, 14, 10, 24, 8}
+	}
+	nameW := widths[2]
+	cfgW := widths[4]
+
 	return m.renderTable(
-		[]string{"#", "NAME", "TYPE", "CONFIG"},
+		headers,
 		len(m.alerts),
 		func(start, end int) [][]string {
 			var rows [][]string
 			for i := start; i < end; i++ {
 				a := m.alerts[i]
+				h := m.engine.GetAlertHealth(a.ID)
 				rows = append(rows, []string{
 					fmt.Sprintf("%d", i+1),
-					m.zones.Mark(fmt.Sprintf("alert-%d", i), limitStr(a.Name, 15)),
+					fmtAlertHealth(h),
+					m.zones.Mark(fmt.Sprintf("alert-%d", i), limitStr(a.Name, nameW-2)),
 					fmtAlertType(a.Type),
-					fmtAlertConfig(struct {
+					limitStr(fmtAlertConfig(struct {
 						Type     string
 						Settings map[string]string
-					}{a.Type, a.Settings}),
+					}{a.Type, a.Settings}), cfgW-2),
+					fmtAlertLastSent(h),
 				})
 			}
 			return rows
 		},
-		nil, nil,
+		widths, nil,
 	)
 }
 
+func (m Model) viewAlertDetailPanel() string {
+	if m.cursor >= len(m.alerts) {
+		return ""
+	}
+	a := m.alerts[m.cursor]
+	h := m.engine.GetAlertHealth(a.ID)
+
+	var b strings.Builder
+
+	b.WriteString(subtleStyle.Render("  Alerts > ") + titleStyle.Render(a.Name) + "\n\n")
+
+	row := func(label, value string) {
+		fmt.Fprintf(&b, "  %-16s %s\n", subtleStyle.Render(label), value)
+	}
+
+	row("Type", fmtAlertType(a.Type))
+
+	if h.LastSendAt.IsZero() {
+		row("Health", subtleStyle.Render("never sent"))
+	} else if h.LastSendOK {
+		row("Health", specialStyle.Render("OK"))
+	} else {
+		row("Health", dangerStyle.Render("FAILED"))
+	}
+
+	if !h.LastSendAt.IsZero() {
+		row("Last Sent", h.LastSendAt.Format("2006-01-02 15:04:05")+" ("+fmtAlertLastSent(h)+")")
+	}
+	if h.SendCount > 0 {
+		row("Sends", fmt.Sprintf("%d sent, %d failed", h.SendCount, h.FailCount))
+	}
+	if h.LastError != "" {
+		row("Last Error", dangerStyle.Render(limitStr(h.LastError, 60)))
+	}
+
+	b.WriteString("\n" + subtleStyle.Render("  CONFIGURATION") + "\n")
+	for k, v := range a.Settings {
+		row(k, v)
+	}
+
+	b.WriteString("\n\n")
+	b.WriteString(subtleStyle.Render("  [i/Esc] Back  [e] Edit  [t] Test  [q] Quit"))
+
+	return lipgloss.NewStyle().Padding(1, 2).Render(b.String())
+}
+
 func (m *Model) initAlertHuhForm() tea.Cmd {
 	m.alertFormData = &alertFormData{
 		AlertType:         "discord",

internal/tui/tab_logs.go

@@ -5,27 +5,83 @@ import (
 	"strings"
 )
 
-func colorizeLog(line string) string {
+type logSeverity int
+
+const (
+	severityInfo logSeverity = iota
+	severityWarn
+	severityDown
+	severityUp
+	severitySystem
+)
+
+func classifyLog(line string) logSeverity {
 	lower := strings.ToLower(line)
 	switch {
 	case strings.Contains(lower, "confirmed down"),
 		strings.Contains(lower, "is down"),
 		strings.Contains(lower, "missed heartbeat"),
-		strings.Contains(lower, "failed check"),
-		strings.Contains(lower, "ssl warning"):
-		return dangerStyle.Render(line)
+		strings.Contains(lower, "alert send failed"):
+		return severityDown
 	case strings.Contains(lower, "recovered"),
 		strings.Contains(lower, "is up"),
-		strings.Contains(lower, "recovery"):
-		return specialStyle.Render(line)
+		strings.Contains(lower, "recovery"),
+		strings.Contains(lower, "first heartbeat"):
+		return severityUp
+	case strings.Contains(lower, "failed check"),
+		strings.Contains(lower, "ssl warning"),
+		strings.Contains(lower, "overdue"),
+		strings.Contains(lower, "was late"):
+		return severityWarn
 	case strings.Contains(lower, "engine"),
-		strings.Contains(lower, "cluster"):
-		return titleStyle.Render(line)
+		strings.Contains(lower, "cluster"),
+		strings.Contains(lower, "loaded"),
+		strings.Contains(lower, "paused"),
+		strings.Contains(lower, "resumed"):
+		return severitySystem
 	default:
-		return line
+		return severityInfo
 	}
 }
 
+func isImportantLog(sev logSeverity) bool {
+	return sev == severityDown || sev == severityUp || sev == severitySystem
+}
+
+func renderLogTag(sev logSeverity) string {
+	switch sev {
+	case severityDown:
+		return dangerStyle.Render(" DOWN ")
+	case severityUp:
+		return specialStyle.Render("  UP  ")
+	case severityWarn:
+		return warnStyle.Render(" WARN ")
+	case severitySystem:
+		return titleStyle.Render(" SYS  ")
+	default:
+		return subtleStyle.Render(" info ")
+	}
+}
+
+func renderLogLine(line string) string {
+	sev := classifyLog(line)
+	tag := renderLogTag(sev)
+
+	ts := ""
+	msg := line
+	if len(line) > 10 && line[0] == '[' {
+		if idx := strings.Index(line, "]"); idx > 0 && idx < 12 {
+			ts = subtleStyle.Render(line[1:idx])
+			msg = strings.TrimSpace(line[idx+1:])
+		}
+	}
+
+	if ts != "" {
+		return fmt.Sprintf("  %s  %s  %s", ts, tag, msg)
+	}
+	return fmt.Sprintf("  %s  %s", tag, msg)
+}
+
 func (m Model) viewLogsTab() string {
 	content := m.logViewport.View()
 	if strings.TrimSpace(content) == "" || content == "Waiting for logs..." {
@@ -33,22 +89,34 @@ func (m Model) viewLogsTab() string {
 	}
 
 	lines := strings.Split(content, "\n")
-	var colored []string
+	var rendered []string
+	total := 0
+	shown := 0
+
 	for _, line := range lines {
-		if line == "" {
-			colored = append(colored, line)
+		if strings.TrimSpace(line) == "" {
 			continue
 		}
-		colored = append(colored, colorizeLog(line))
+		total++
+		sev := classifyLog(line)
+		if m.logFilterImportant && !isImportantLog(sev) {
+			continue
+		}
+		shown++
+		rendered = append(rendered, renderLogLine(line))
 	}
 
-	count := 0
-	for _, l := range lines {
-		if strings.TrimSpace(l) != "" {
-			count++
-		}
+	filterLabel := "All"
+	if m.logFilterImportant {
+		filterLabel = "Important"
 	}
 
-	header := subtleStyle.Render(fmt.Sprintf("  %d entries  [↑/↓] Scroll  [PgUp/PgDn] Page", count))
-	return "\n" + header + "\n\n" + strings.Join(colored, "\n")
+	header := subtleStyle.Render(fmt.Sprintf(
+		"  %d entries  [↑/↓] Scroll  [PgUp/PgDn] Page  [f] Filter: %s", shown, filterLabel))
+
+	if m.logFilterImportant && shown < total {
+		header += subtleStyle.Render(fmt.Sprintf("  (%d hidden)", total-shown))
+	}
+
+	return "\n" + header + "\n\n" + strings.Join(rendered, "\n")
 }

internal/tui/tab_maint.go

@@ -2,10 +2,11 @@ package tui
 
 import (
 	"fmt"
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
 	"strconv"
 	"time"
 
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/huh"
 	"github.com/charmbracelet/lipgloss"
@@ -40,19 +41,19 @@ func fmtMaintType(t string) string {
 	return maintStyle.Render("maintenance")
 }
 
-func fmtMaintMonitor(monitorID int, sites []models.Site) string {
+func fmtMaintMonitorW(monitorID int, sites []models.Site, maxW int) string {
 	if monitorID == 0 {
 		return "All"
 	}
 	for _, s := range sites {
 		if s.ID == monitorID {
-			return limitStr(s.Name, 18)
+			return limitStr(s.Name, maxW)
 		}
 	}
 	return fmt.Sprintf("#%d", monitorID)
 }
 
-func fmtMaintTime(t time.Time) string {
+func fmtMaintTime(t time.Time, colW int) string {
 	if t.IsZero() {
 		return subtleStyle.Render("—")
 	}
@@ -60,8 +61,11 @@ func fmtMaintTime(t time.Time) string {
 	if t.Year() == now.Year() && t.YearDay() == now.YearDay() {
 		return t.Format("15:04")
 	}
+	if colW >= 14 {
 		return t.Format("15:04 Jan 02")
 	}
+	return t.Format("Jan 02")
+}
 
 func (m Model) isMonitorInMaintenance(monitorID int) bool {
 	for _, mw := range m.maintenanceWindows {
@@ -92,8 +96,21 @@ func (m Model) viewMaintTab() string {
 		return "\n  No maintenance windows or incidents. Press [n] to create one."
 	}
 
+	var headers []string
+	var widths []int
+	if m.isWide() {
+		headers = []string{"#", "TITLE", "TYPE", "MONITORS", "STATUS", "STARTED", "ENDS"}
+		widths = []int{4, 24, 14, 22, 12, 16, 16}
+	} else {
+		headers = []string{"#", "TITLE", "TYPE", "MON", "ST", "START", "ENDS"}
+		widths = []int{4, 14, 13, 14, 11, 14, 14}
+	}
+	titleW := widths[1]
+	monW := widths[3]
+	timeW := widths[5]
+
 	return m.renderTable(
-		[]string{"#", "TITLE", "TYPE", "MONITORS", "STATUS", "STARTED", "ENDS"},
+		headers,
 		len(m.maintenanceWindows),
 		func(start, end int) [][]string {
 			var rows [][]string
@@ -102,17 +119,17 @@ func (m Model) viewMaintTab() string {
 				mw := m.maintenanceWindows[i]
 				rows = append(rows, []string{
 					strconv.Itoa(i + 1),
-					m.zones.Mark(fmt.Sprintf("maint-%d", i), limitStr(mw.Title, 24)),
+					m.zones.Mark(fmt.Sprintf("maint-%d", i), limitStr(mw.Title, titleW-2)),
 					fmtMaintType(mw.Type),
-					fmtMaintMonitor(mw.MonitorID, allSites),
+					fmtMaintMonitorW(mw.MonitorID, allSites, monW-2),
 					fmtMaintStatus(mw),
-					fmtMaintTime(mw.StartTime),
-					fmtMaintTime(mw.EndTime),
+					fmtMaintTime(mw.StartTime, timeW),
+					fmtMaintTime(mw.EndTime, timeW),
 				})
 			}
 			return rows
 		},
-		[]int{6, 0, 14, 20, 12, 16, 16},
+		widths,
 		nil,
 	)
 }

internal/tui/tab_nodes.go

@@ -10,16 +10,25 @@ func (m Model) viewNodesTab() string {
 		return "\n  No probe nodes connected."
 	}
 
-	colWidths := []int{0, 12, 20, 10, 8}
+	var headers []string
+	var widths []int
+	if m.isWide() {
+		headers = []string{"NAME", "REGION", "LAST SEEN", "VERSION", "STATUS"}
+		widths = []int{24, 14, 16, 12, 10}
+	} else {
+		headers = []string{"NAME", "REGION", "SEEN", "VER", "STATUS"}
+		widths = []int{16, 10, 10, 8, 8}
+	}
+	nameW := widths[0]
 
 	return m.renderTable(
-		[]string{"NAME", "REGION", "LAST SEEN", "VERSION", "STATUS"},
+		headers,
 		len(m.nodes),
 		func(start, end int) [][]string {
 			var rows [][]string
 			for i := start; i < end; i++ {
 				node := m.nodes[i]
-				name := limitStr(node.Name, 20)
+				name := limitStr(node.Name, nameW-2)
 				if name == "" {
 					name = node.ID
 				}
@@ -37,7 +46,7 @@ func (m Model) viewNodesTab() string {
 			}
 			return rows
 		},
-		colWidths,
+		widths,
 		nil,
 	)
 }

internal/tui/tab_sites.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
 
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/huh"
@@ -60,14 +60,18 @@ type siteFormData struct {
 	Regions       string
 }
 
-func latencySparkline(latencies []time.Duration, width int) string {
+func latencySparkline(latencies []time.Duration, statuses []bool, width int) string {
 	if len(latencies) == 0 {
 		return subtleStyle.Render(strings.Repeat("·", width))
 	}
 
 	samples := latencies
+	sampledStatuses := statuses
 	if len(samples) > width {
 		samples = samples[len(samples)-width:]
+		if len(sampledStatuses) > width {
+			sampledStatuses = sampledStatuses[len(sampledStatuses)-width:]
+		}
 	}
 
 	minL, maxL := samples[0], samples[0]
@@ -85,7 +89,7 @@ func latencySparkline(latencies []time.Duration, width int) string {
 		sb.WriteString(subtleStyle.Render(strings.Repeat("·", remaining)))
 	}
 	spread := maxL - minL
-	for _, l := range samples {
+	for i, l := range samples {
 		idx := 0
 		if spread > 0 {
 			idx = int(float64(l-minL) / float64(spread) * 7)
@@ -94,6 +98,10 @@ func latencySparkline(latencies []time.Duration, width int) string {
 			}
 		}
 		ch := string(sparkChars[idx])
+		isDown := i < len(sampledStatuses) && !sampledStatuses[i]
+		if isDown {
+			sb.WriteString(dangerStyle.Render(ch))
+		} else {
 			ms := l.Milliseconds()
 			if ms < 200 {
 				sb.WriteString(specialStyle.Render(ch))
@@ -103,6 +111,7 @@ func latencySparkline(latencies []time.Duration, width int) string {
 				sb.WriteString(dangerStyle.Render(ch))
 			}
 		}
+	}
 	return sb.String()
 }
 
@@ -302,6 +311,8 @@ func fmtStatus(status string, paused bool, inMaint bool) string {
 	switch status {
 	case "DOWN", "SSL EXP":
 		return dangerStyle.Render(status)
+	case "LATE":
+		return warnStyle.Render(status)
 	case "PENDING":
 		return subtleStyle.Render(status)
 	default:
@@ -309,28 +320,94 @@ func fmtStatus(status string, paused bool, inMaint bool) string {
 	}
 }
 
-func (m Model) dynamicWidths() (nameW, sparkW int) {
-	fixed := 6 + 10 + 10 + 8 + 8 + 7 + 9 // #, TYPE, STATUS, LATENCY, UPTIME, SSL, RETRY
-	overhead := 30                       // cell padding + borders
-	avail := m.termWidth - chromePadH - 2 - fixed - overhead
-	if avail < 30 {
-		avail = 30
+func fmtDuration(d time.Duration) string {
+	if d < time.Minute {
+		return fmt.Sprintf("%ds", int(d.Seconds()))
+	}
+	if d < time.Hour {
+		return fmt.Sprintf("%dm", int(d.Minutes()))
+	}
+	if d < 24*time.Hour {
+		h := int(d.Hours())
+		m := int(d.Minutes()) % 60
+		if m > 0 {
+			return fmt.Sprintf("%dh %dm", h, m)
+		}
+		return fmt.Sprintf("%dh", h)
+	}
+	days := int(d.Hours()) / 24
+	hours := int(d.Hours()) % 24
+	if hours > 0 {
+		return fmt.Sprintf("%dd %dh", days, hours)
+	}
+	return fmt.Sprintf("%dd", days)
+}
+
+type tableLayout struct {
+	nameW, sparkW int
+	headers       []string
+	colWidths     []int
+}
+
+func (m Model) computeLayout() tableLayout {
+	wide := m.isWide()
+
+	var fixed int
+	var headers []string
+	var widths []int
+
+	if wide {
+		//              #   NAME TYPE   STATUS LATENCY UPTIME HISTORY SSL RETRIES
+		headers = []string{"#", "NAME", "TYPE", "STATUS", "LATENCY", "UPTIME", "HISTORY", "SSL", "RETRIES"}
+		widths = []int{4, 0, 10, 10, 10, 8, 0, 7, 9}
+		fixed = 4 + 10 + 10 + 10 + 8 + 7 + 9
+	} else {
+		//              #   NAME TYPE   STATUS LAT   UP%   HISTORY SSL RT
+		headers = []string{"#", "NAME", "TYPE", "STATUS", "LAT", "UP%", "HISTORY", "SSL", "RT"}
+		widths = []int{4, 0, 8, 8, 7, 8, 0, 5, 5}
+		fixed = 4 + 8 + 8 + 7 + 8 + 5 + 5
+	}
+
+	numCols := len(headers)
+	borderOverhead := 2 + (numCols - 1)
+	avail := m.termWidth - chromePadH - 2 - borderOverhead - fixed
+	if avail < 20 {
+		avail = 20
+	}
+
+	maxName := 0
+	for _, s := range m.sites {
+		if n := len([]rune(s.Name)); n > maxName {
+			maxName = n
+		}
+	}
+	maxName += 4
+
+	nameW := avail / 2
+	if nameW > maxName {
+		nameW = maxName
 	}
-	nameW = avail / 2
-	sparkW = avail - nameW - 2 // -2 for spark column padding
 	if nameW < 13 {
 		nameW = 13
 	}
 	if nameW > 40 {
 		nameW = 40
 	}
+
+	sparkW := avail - nameW
 	if sparkW < 10 {
 		sparkW = 10
 	}
-	if sparkW > 60 {
-		sparkW = 60
+
+	widths[1] = nameW
+	widths[6] = sparkW
+
+	return tableLayout{
+		nameW:     nameW,
+		sparkW:    sparkW,
+		headers:   headers,
+		colWidths: widths,
 	}
-	return
 }
 
 func (m Model) viewSitesTab() string {
@@ -348,12 +425,16 @@ func (m Model) viewSitesTab() string {
 		return "\n" + welcome
 	}
 
-	nameW, sparkWidth := m.dynamicWidths()
-	colWidths := []int{6, 0, 10, 10, 8, 8, sparkWidth + 2, 7, 9}
+	layout := m.computeLayout()
+	nameW := layout.nameW
+	sparkWidth := layout.sparkW - 2
+	if sparkWidth < 8 {
+		sparkWidth = 8
+	}
 
 	var groupRows map[int]bool
 	return m.renderTable(
-		[]string{"#", "NAME", "TYPE", "STATUS", "LATENCY", "UPTIME", "HISTORY", "SSL", "RETRY"},
+		layout.headers,
 		len(m.sites),
 		func(start, end int) [][]string {
 			groupRows = make(map[int]bool)
@@ -366,7 +447,7 @@ func (m Model) viewSitesTab() string {
 					icon := typeIcon("group", m.collapsed[site.ID])
 					rows = append(rows, []string{
 						strconv.Itoa(i + 1),
-						m.zones.Mark(fmt.Sprintf("site-%d", i), icon+" "+limitStr(site.Name, nameW-2)),
+						m.zones.Mark(fmt.Sprintf("site-%d", i), icon+" "+limitStr(site.Name, nameW-4)),
 						"group",
 						fmtStatus(site.Status, site.Paused, m.isMonitorInMaintenance(site.ID)),
 						subtleStyle.Render("—"),
@@ -384,9 +465,17 @@ func (m Model) viewSitesTab() string {
 					if i+1 >= len(m.sites) || m.sites[i+1].ParentID != site.ParentID {
 						prefix = "└"
 					}
-					name = prefix + " " + limitStr(name, nameW-2)
+					name = prefix + " " + limitStr(name, nameW-4)
 				} else {
-					name = limitStr(name, nameW)
+					name = limitStr(name, nameW-2)
+				}
+
+				if (site.Status == "DOWN" || site.Status == "SSL EXP" || site.Status == "LATE") && site.LastError != "" {
+					nameLen := len([]rune(name))
+					errSpace := nameW - nameLen - 3
+					if errSpace > 10 {
+						name = name + " " + subtleStyle.Render(limitStr(site.LastError, errSpace))
+					}
 				}
 
 				hist, _ := m.engine.GetHistory(site.ID)
@@ -394,7 +483,7 @@ func (m Model) viewSitesTab() string {
 				if site.Type == "push" {
 					spark = heartbeatSparkline(hist.Statuses, sparkWidth)
 				} else {
-					spark = latencySparkline(hist.Latencies, sparkWidth)
+					spark = latencySparkline(hist.Latencies, hist.Statuses, sparkWidth)
 				}
 
 				rows = append(rows, []string{
@@ -411,7 +500,7 @@ func (m Model) viewSitesTab() string {
 			}
 			return rows
 		},
-		colWidths,
+		layout.colWidths,
 		func(row, col int) *lipgloss.Style {
 			if groupRows[row] {
 				s := siteGroupStyle
@@ -731,7 +820,30 @@ func (m Model) viewDetailPanel() string {
 		fmt.Fprintf(&b, "  %-16s %s\n", subtleStyle.Render(label), value)
 	}
 
+	section := func(label string) {
+		b.WriteString("\n" + subtleStyle.Render("  "+label) + "\n")
+	}
+
 	row("Status", fmtStatus(site.Status, site.Paused, m.isMonitorInMaintenance(site.ID)))
+
+	if (site.Status == "DOWN" || site.Status == "SSL EXP" || site.Status == "LATE") && site.LastError != "" {
+		row("Error", dangerStyle.Render(limitStr(site.LastError, 60)))
+	}
+
+	if site.Type == "http" && site.StatusCode > 0 {
+		row("HTTP Code", strconv.Itoa(site.StatusCode))
+	}
+
+	if !site.StatusChangedAt.IsZero() {
+		dur := time.Since(site.StatusChangedAt)
+		row("State Since", site.StatusChangedAt.Format("2006-01-02 15:04:05")+" ("+fmtDuration(dur)+")")
+	}
+
+	if !site.LastSuccessAt.IsZero() {
+		ago := time.Since(site.LastSuccessAt)
+		row("Last Success", site.LastSuccessAt.Format("15:04:05")+" ("+fmtDuration(ago)+" ago)")
+	}
+
 	if m.isMonitorInMaintenance(site.ID) {
 		for _, mw := range m.maintenanceWindows {
 			if mw.Type == "maintenance" && (mw.MonitorID == 0 || mw.MonitorID == site.ID || mw.MonitorID == site.ParentID) {
@@ -740,6 +852,8 @@ func (m Model) viewDetailPanel() string {
 			}
 		}
 	}
+
+	section("ENDPOINT")
 	row("Type", site.Type)
 	if site.URL != "" {
 		row("URL", site.URL)
@@ -750,20 +864,36 @@ func (m Model) viewDetailPanel() string {
 	if site.Port > 0 {
 		row("Port", strconv.Itoa(site.Port))
 	}
+
+	section("TIMING")
 	row("Interval", fmt.Sprintf("%ds", site.Interval))
+	if site.Timeout > 0 {
 		row("Timeout", fmt.Sprintf("%ds", site.Timeout))
+	}
 	row("Latency", fmtLatency(site.Latency))
 	row("Uptime", fmtUptime(hist.Statuses))
+	if !site.LastCheck.IsZero() {
+		row("Last Check", site.LastCheck.Format("15:04:05"))
+	}
 
 	if site.Type == "http" {
+		section("HTTP")
+		if site.Method != "" && site.Method != "GET" {
 			row("Method", site.Method)
-		row("Codes", site.AcceptedCodes)
+		}
+		codes := site.AcceptedCodes
+		if codes == "" {
+			codes = "200-299"
+		}
+		row("Codes", codes)
 		row("SSL", fmtSSL(site))
 		if site.IgnoreTLS {
 			row("TLS Verify", dangerStyle.Render("disabled"))
 		}
 	}
 
+	if site.MaxRetries > 0 || site.Regions != "" || site.Description != "" {
+		section("CONFIG")
 		if site.MaxRetries > 0 {
 			row("Retries", fmtRetries(site))
 		}
@@ -773,8 +903,6 @@ func (m Model) viewDetailPanel() string {
 		if site.Description != "" {
 			row("Description", site.Description)
 		}
-	if !site.LastCheck.IsZero() {
-		row("Last Check", site.LastCheck.Format("15:04:05"))
 	}
 
 	probeResults := m.engine.GetProbeResults(site.ID)
@@ -787,7 +915,30 @@ func (m Model) viewDetailPanel() string {
 			}
 			latency := time.Duration(result.LatencyNs).Milliseconds()
 			ago := time.Since(result.CheckedAt).Truncate(time.Second)
-			fmt.Fprintf(&b, "  %-14s %s  %dms  %s ago\n", nodeID, status, latency, ago)
+			line := fmt.Sprintf("  %-14s %s  %dms  %s ago", nodeID, status, latency, ago)
+			if !result.IsUp && result.ErrorReason != "" {
+				line += "  " + dangerStyle.Render(limitStr(result.ErrorReason, 30))
+			}
+			b.WriteString(line + "\n")
+		}
+	}
+
+	stateChanges := m.engine.GetStateChanges(site.ID, 5)
+	if len(stateChanges) > 0 {
+		b.WriteString("\n" + subtleStyle.Render("  STATE CHANGES") + "\n")
+		for _, sc := range stateChanges {
+			ago := fmtDuration(time.Since(sc.ChangedAt))
+			arrow := subtleStyle.Render(sc.FromStatus) + " → "
+			if sc.ToStatus == "UP" {
+				arrow += specialStyle.Render(sc.ToStatus)
+			} else {
+				arrow += dangerStyle.Render(sc.ToStatus)
+			}
+			line := fmt.Sprintf("  %s  %s", arrow, subtleStyle.Render(ago+" ago"))
+			if sc.ErrorReason != "" && sc.ToStatus != "UP" {
+				line += "  " + dangerStyle.Render(limitStr(sc.ErrorReason, 40))
+			}
+			b.WriteString(line + "\n")
 		}
 	}
 
@@ -807,20 +958,27 @@ func (m Model) viewDetailPanel() string {
 				up, len(hist.Statuses))
 		}
 	} else {
-		b.WriteString("  " + latencySparkline(hist.Latencies, sparkWidth))
-		if len(hist.Latencies) > 0 {
-			minL, maxL := hist.Latencies[0], hist.Latencies[0]
-			var total time.Duration
-			for _, l := range hist.Latencies {
-				total += l
-				if l < minL {
-					minL = l
+		b.WriteString("  " + latencySparkline(hist.Latencies, hist.Statuses, sparkWidth))
+		// Stats over successful checks only — a failed check is stored as 0ns latency
+		// and would otherwise drag Min to 0ms and skew the average.
+		var minL, maxL, total time.Duration
+		count := 0
+		for i, l := range hist.Latencies {
+			if i < len(hist.Statuses) && !hist.Statuses[i] {
+				continue
 			}
-				if l > maxL {
+			if count == 0 {
+				minL, maxL = l, l
+			} else if l < minL {
+				minL = l
+			} else if l > maxL {
 				maxL = l
 			}
+			total += l
+			count++
 		}
-			avg := total / time.Duration(len(hist.Latencies))
+		if count > 0 {
+			avg := total / time.Duration(count)
 			fmt.Fprintf(&b, "\n  %s %dms  %s %dms  %s %dms",
 				subtleStyle.Render("Min"), minL.Milliseconds(),
 				subtleStyle.Render("Avg"), avg.Milliseconds(),

internal/tui/tab_users.go

@@ -32,8 +32,19 @@ func (m Model) viewUsersTab() string {
 		return "\n  No users configured. Press [n] to add one."
 	}
 
+	var headers []string
+	var widths []int
+	if m.isWide() {
+		headers = []string{"#", "USERNAME", "ROLE", "PUBLIC KEY"}
+		widths = []int{4, 18, 10, 50}
+	} else {
+		headers = []string{"#", "USER", "ROLE", "KEY"}
+		widths = []int{4, 14, 8, 30}
+	}
+	userW := widths[1]
+
 	return m.renderTable(
-		[]string{"#", "USERNAME", "ROLE", "PUBLIC KEY"},
+		headers,
 		len(m.users),
 		func(start, end int) [][]string {
 			var rows [][]string
@@ -41,14 +52,14 @@ func (m Model) viewUsersTab() string {
 				u := m.users[i]
 				rows = append(rows, []string{
 					fmt.Sprintf("%d", i+1),
-					m.zones.Mark(fmt.Sprintf("user-%d", i), limitStr(u.Username, 15)),
+					m.zones.Mark(fmt.Sprintf("user-%d", i), limitStr(u.Username, userW-2)),
 					fmtRole(u.Role),
 					fmtKey(u.PublicKey),
 				})
 			}
 			return rows
 		},
-		nil, nil,
+		widths, nil,
 	)
 }
 

internal/tui/table_helpers.go

@@ -15,6 +15,12 @@ var (
 
 type StyleOverride func(row, col int) *lipgloss.Style
 
+const wideBreakpoint = 120
+
+func (m Model) isWide() bool {
+	return m.termWidth >= wideBreakpoint
+}
+
 func (m Model) renderTable(headers []string, items int, buildRows func(start, end int) [][]string, colWidths []int, styleOverride StyleOverride) string {
 	if items == 0 {
 		return ""
@@ -28,7 +34,16 @@ func (m Model) renderTable(headers []string, items int, buildRows func(start, en
 	selectedVisual := m.cursor - m.tableOffset
 	rows := buildRows(m.tableOffset, end)
 
-	tableWidth := m.termWidth - chromePadH - 2
+	colTotal := 0
+	for _, w := range colWidths {
+		colTotal += w
+	}
+	borderOverhead := 2 + len(colWidths) - 1
+	tableWidth := colTotal + borderOverhead
+	maxWidth := m.termWidth - chromePadH - 2
+	if tableWidth > maxWidth {
+		tableWidth = maxWidth
+	}
 	if tableWidth < 40 {
 		tableWidth = 40
 	}
@@ -41,7 +56,11 @@ func (m Model) renderTable(headers []string, items int, buildRows func(start, en
 		Rows(rows...).
 		StyleFunc(func(row, col int) lipgloss.Style {
 			if row == table.HeaderRow {
-				return tableHeaderStyle
+				h := tableHeaderStyle
+				if col < len(colWidths) && colWidths[col] > 0 {
+					h = h.Width(colWidths[col]).MaxWidth(colWidths[col])
+				}
+				return h
 			}
 			isSelected := row == selectedVisual
 			if styleOverride != nil {
@@ -51,7 +70,7 @@ func (m Model) renderTable(headers []string, items int, buildRows func(start, en
 						style = tableSelectedStyle.Foreground(s.GetForeground())
 					}
 					if col < len(colWidths) && colWidths[col] > 0 {
-						style = style.Width(colWidths[col])
+						style = style.Width(colWidths[col]).MaxWidth(colWidths[col])
 					}
 					return style
 				}
@@ -64,7 +83,7 @@ func (m Model) renderTable(headers []string, items int, buildRows func(start, en
 				base = tableSelectedStyle
 			}
 			if col < len(colWidths) && colWidths[col] > 0 {
-				base = base.Width(colWidths[col])
+				base = base.Width(colWidths[col]).MaxWidth(colWidths[col])
 			}
 			return base
 		})

internal/tui/tui.go

@@ -4,13 +4,14 @@ import (
 	"encoding/json"
 	"fmt"
 	"math"
+	"os"
 	"sort"
 	"strings"
 	"time"
 
-	"gitea.lerkolabs.com/lerko/uptop/internal/models"
-	"gitea.lerkolabs.com/lerko/uptop/internal/monitor"
-	"gitea.lerkolabs.com/lerko/uptop/internal/store"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/models"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/monitor"
+	"gitea.lerkolabs.com/lerkolabs/uptop/internal/store"
 
 	"github.com/charmbracelet/bubbles/viewport"
 	tea "github.com/charmbracelet/bubbletea"
@@ -68,6 +69,7 @@ const (
 	stateLogs
 	stateUsers
 	stateDetail
+	stateAlertDetail
 	stateFormSite
 	stateFormAlert
 	stateFormUser
@@ -93,6 +95,7 @@ type Model struct {
 	maintFormData *maintFormData
 
 	logViewport        viewport.Model
+	logFilterImportant bool
 	isAdmin            bool
 	zones              *zone.Manager
 
@@ -120,6 +123,10 @@ type Model struct {
 
 	filterMode bool
 	filterText string
+
+	// demoMode renders a stable status dot instead of the animated pulse so
+	// screenshots/recordings don't capture the spinner mid-frame. Set via UPTOP_DEMO=1.
+	demoMode bool
 }
 
 func InitialModel(isAdmin bool, s store.Store, eng *monitor.Engine) Model {
@@ -153,6 +160,7 @@ func InitialModel(isAdmin bool, s store.Store, eng *monitor.Engine) Model {
 		collapsed:    collapsed,
 		theme:        theme,
 		themeIndex:   themeIdx,
+		demoMode:     os.Getenv("UPTOP_DEMO") == "1",
 	}
 }
 
@@ -383,6 +391,14 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				return m, tea.Quit
 			}
 			return m, nil
+		case stateAlertDetail:
+			switch msg.String() {
+			case "i", "esc":
+				m.state = stateDashboard
+			case "q":
+				return m, tea.Quit
+			}
+			return m, nil
 		case stateDashboard, stateLogs, stateUsers:
 			switch msg.String() {
 			case "q":
@@ -392,6 +408,11 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 					m.filterMode = true
 					return m, nil
 				}
+			case "f":
+				if m.state == stateLogs {
+					m.logFilterImportant = !m.logFilterImportant
+					return m, nil
+				}
 			case "tab":
 				m.switchTab(m.currentTab + 1)
 			case "pgup", "pgdown":
@@ -463,6 +484,16 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 					m.state = stateFormUser
 					return m, m.initUserHuhForm()
 				}
+			case "t":
+				if m.currentTab == 1 && len(m.alerts) > 0 {
+					a := m.alerts[m.cursor]
+					go func() {
+						if err := m.engine.TestAlert(a.ID); err != nil {
+							m.engine.AddLog(fmt.Sprintf("Test alert failed (%s): %v", a.Name, err))
+						}
+					}()
+					return m, nil
+				}
 			case " ":
 				if m.currentTab == 0 && len(m.sites) > 0 && m.sites[m.cursor].Type == "group" {
 					gid := m.sites[m.cursor].ID
@@ -481,6 +512,8 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			case "i":
 				if m.currentTab == 0 && len(m.sites) > 0 {
 					m.state = stateDetail
+				} else if m.currentTab == 1 && len(m.alerts) > 0 {
+					m.state = stateAlertDetail
 				}
 			case "x":
 				if m.currentTab == 4 && len(m.maintenanceWindows) > 0 {
@@ -727,11 +760,6 @@ func (m *Model) submitForm() {
 }
 
 func (m Model) pulseIndicator() string {
-	frame := m.tickCount % len(pulseFrames)
-	brightness := int(m.pulsePos*155) + 100
-	if brightness > 255 {
-		brightness = 255
-	}
 	hasDown := false
 	for _, s := range m.sites {
 		if !s.Paused && !m.isMonitorInMaintenance(s.ID) && (s.Status == "DOWN" || s.Status == "SSL EXP") {
@@ -739,6 +767,19 @@ func (m Model) pulseIndicator() string {
 			break
 		}
 	}
+	// Stills can't show animation: render a stable status dot in demo mode.
+	if m.demoMode {
+		c := m.theme.Success
+		if hasDown {
+			c = m.theme.Danger
+		}
+		return lipgloss.NewStyle().Foreground(c).Render("●")
+	}
+	frame := m.tickCount % len(pulseFrames)
+	brightness := int(m.pulsePos*155) + 100
+	if brightness > 255 {
+		brightness = 255
+	}
 	var color string
 	if hasDown {
 		color = fmt.Sprintf("#%02x%02x%02x", brightness, brightness/4, brightness/4)
@@ -802,6 +843,8 @@ func (m Model) View() string {
 		return ""
 	case stateDetail:
 		return m.viewDetailPanel()
+	case stateAlertDetail:
+		return m.viewAlertDetailPanel()
 	default:
 		return m.zones.Scan(m.viewDashboard())
 	}
@@ -811,13 +854,20 @@ func (m Model) viewDashboard() string {
 	allSites := m.engine.GetAllSites()
 	totalMonitors := 0
 	downCount := 0
+	lateCount := 0
 	for _, s := range allSites {
 		if s.Type == "group" {
 			continue
 		}
 		totalMonitors++
-		if !s.Paused && !m.isMonitorInMaintenance(s.ID) && (s.Status == "DOWN" || s.Status == "SSL EXP") {
+		if s.Paused || m.isMonitorInMaintenance(s.ID) {
+			continue
+		}
+		switch s.Status {
+		case "DOWN", "SSL EXP":
 			downCount++
+		case "LATE":
+			lateCount++
 		}
 	}
 	offlineNodes := 0
@@ -830,6 +880,8 @@ func (m Model) viewDashboard() string {
 	var sitesLabel string
 	if downCount > 0 {
 		sitesLabel = fmt.Sprintf("Sites (%d↓)", downCount)
+	} else if lateCount > 0 {
+		sitesLabel = fmt.Sprintf("Sites (%d⚠)", lateCount)
 	} else if totalMonitors > 0 {
 		sitesLabel = fmt.Sprintf("Sites (%d)", totalMonitors)
 	} else {
@@ -895,14 +947,19 @@ func (m Model) viewDashboard() string {
 		}
 	}
 
-	upCount := totalMonitors - downCount
+	upCount := totalMonitors - downCount - lateCount
 	var upStr string
 	if downCount > 0 {
 		upStr = dangerStyle.Render(fmt.Sprintf("%d/%d UP", upCount, totalMonitors))
+	} else if lateCount > 0 {
+		upStr = warnStyle.Render(fmt.Sprintf("%d/%d UP", upCount, totalMonitors))
 	} else {
 		upStr = specialStyle.Render(fmt.Sprintf("%d/%d UP", upCount, totalMonitors))
 	}
 	statusParts := []string{upStr}
+	if lateCount > 0 {
+		statusParts = append(statusParts, warnStyle.Render(fmt.Sprintf("%d LATE", lateCount)))
+	}
 	if len(m.nodes) > 0 {
 		online := 0
 		for _, n := range m.nodes {
@@ -910,7 +967,11 @@ func (m Model) viewDashboard() string {
 				online++
 			}
 		}
-		statusParts = append(statusParts, fmt.Sprintf("%d probes", online))
+		probeLabel := "probes"
+		if online == 1 {
+			probeLabel = "probe"
+		}
+		statusParts = append(statusParts, fmt.Sprintf("%d %s", online, probeLabel))
 	}
 	statusLine := strings.Join(statusParts, subtleStyle.Render(" · "))
 
@@ -923,6 +984,10 @@ func (m Model) viewDashboard() string {
 		switch m.currentTab {
 		case 0:
 			keys = "[/]Filter [n]New [e]Edit [i]Info [d]Del [p]Pause [T]Theme [Tab]Switch [q]Quit"
+		case 1:
+			keys = "[n]New [e]Edit [i]Info [d]Del [t]Test [T]Theme [Tab]Switch [q]Quit"
+		case 2:
+			keys = "[f]Filter [T]Theme [Tab]Switch [q]Quit"
 		case 4:
 			keys = "[n]New [x]End [d]Del [T]Theme [Tab]Switch [q]Quit"
 		case 5:
@@ -949,10 +1014,12 @@ func siteOrder(s models.Site) int {
 	switch s.Status {
 	case "DOWN", "SSL EXP":
 		return 0
-	case "PENDING":
-		return 2
-	default:
+	case "LATE":
 		return 1
+	case "PENDING":
+		return 3
+	default:
+		return 2
 	}
 }