O-9: Authentik metrics + ServiceMonitor + 4 app dashboards

[alexrf45]

Closes

O-9 (App-level dashboards/alerts) from the open-items punch list. Source: _docs/reviews/home-0ps-review-2026-05-27.md line 119.

What's in this PR

• Authentik HR: enable metrics.enabled: true on both server and worker (chart provisions the two metrics Services). Chart-side ServiceMonitor stays disabled — ownership of ServiceMonitors is centralised in _lib/observability/kube-prometheus-stack/ (same pattern as falco), so cardinality/relabel changes happen in one place.
• servicemonitor-authentik.yaml (new): cross-namespace selects both authentik-server-metrics + authentik-worker-metrics Services via one matchExpressions block. 60s scrape interval.
• 4 dashboard ConfigMaps under _lib/observability/kube-prometheus-stack/dashboards/ — sidecar-discovered via grafana_dashboard: "1" label:
  • authentik — community grafana.com/14837 r2 (beryju), normalised (stripped __inputs/__requires, replaced ${DS_PROMETHEUS} with Prometheus datasource, cleared id)
  • cloudflared — community dashboard, same normalisation
  • gatus — hand-authored — uptime & latency panels
  • freshrss — hand-authored — service-health panels
• .yamllint.yaml updated: ignore the 2 community-sourced dashboard YAMLs (embedded markdown in panel content: blocks exceeds the 300-char line cap; pinned to specific revisions per file header, not hand-edited)

Scope discipline

O-10 (postgres-exporter + DB-content panels) is a separate sprint. Dashboards in this PR show operational metrics only — request rates, latency, pod health, scrape targets. Custom DB-content queries (freshrss unread/favorites, authentik login stats) wait for the postgres-exporter rollout in O-10.

Acceptance test

CI runs .claude/sprints/o-9/accept.sh via .github/workflows/sprint-accept.yml. Local pass:

[accept:O-9] yamllint 8 files
[accept:O-9] kubectl kustomize _lib/observability/kube-prometheus-stack
[accept:O-9] assert: ServiceMonitor 'authentik' in obs render
[accept:O-9] assert: dashboard ConfigMaps present
[accept:O-9]   found: dashboard-authentik
[accept:O-9]   found: dashboard-cloudflared
[accept:O-9]   found: dashboard-gatus
[accept:O-9]   found: dashboard-freshrss
[accept:O-9] assert: every dashboard ConfigMap has label grafana_dashboard=1
[accept:O-9] assert: Authentik HR has server.metrics.enabled == true
[accept:O-9] assert: Authentik HR has worker.metrics.enabled == true
[accept:O-9] assert: Authentik HR server.metrics.serviceMonitor.enabled == false
[accept:O-9] assert: ServiceMonitor 'authentik' targets authentik ns
[accept:O-9] PASS

Post-merge manual checks (not in accept.sh)

• kube dev -n monitoring exec deploy/prometheus-kps-prometheus-0 -- wget -qO- localhost:9090/api/v1/targets | grep authentik — authentik metrics targets up (server + worker)
• Grafana sidebar: 4 new dashboards visible (Authentik, Cloudflared, Gatus, FreshRSS)

Background — subagent session-limit + recovery

This PR was driven by the /sprint-orchestrate parallel executor as wave 2 alongside O-11. The O-9 subagent completed the implementation but hit the global session limit before committing — the work was left uncommitted in /tmp/sprints/o-9. The orchestrator (me) verified the agent's edits (architecture, ServiceMonitor pattern, dashboard provenance, yamllint workaround), committed them as a single logical commit, rebased, ran the acceptance test, and opened this PR.

Also during recovery: discovered that PRs #46 (H-3) + #47 (O-11) had been merged on GitHub but were missing from origin/dev — looks like a force-push to dev clobbered the merge commits. Recovered both via git cherry-pick -m 1 of the GitHub merge commits (9b6881f, 290677a) onto current dev, then pushed eb197cf + 6f51280. O-9 was rebased onto the now-correct dev tip before this PR was opened.

Worktree

/tmp/sprints/o-9 (clean up after merge: git worktree remove /tmp/sprints/o-9 && git branch -D sprint/o-9)

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