Sonarr and radarr currently expose no Prometheus metrics, so queue depth, indexer health, and library stats are invisible to the observability stack. This adds the standard exportarr exporter as a sidecar to both Deployments.
- Adds an exportarr sidecar (ghcr.io/onedr0p/exportarr v2.3.0, pulled through the artifactapi `ghcr` remote, which already whitelists `^onedr0p/`) to the sonarr and radarr Deployments
- Points each exporter at its local replica via env (`URL=http://localhost:8989/sonarr` / `:7878/radarr`, matching the apps' UrlBase) and reuses the existing VSO-synced API-key Secrets (`sonarr-apikey`/`radarr-apikey`, key `apitoken`) via `APIKEY` secretKeyRef — no key in argv
- Serves metrics on 9707 (sonarr) / 9708 (radarr) with `/healthz` liveness+readiness probes and small resources (25m/32Mi requests, 100m/128Mi limits)
- Adds per-app VMPodScrape objects (picked up by the observability VMAgent, selectAllByDefault); pod-level rather than VMServiceScrape because the app Services don't expose the metrics port
Validated with `kustomize build apps/base/arrstack` + kubeconform (0 invalid).
Note: with 3 replicas per app, each pod's exporter reports the same shared-Postgres-backed stats, so series are duplicated across the `pod` label; dashboards should aggregate with `max` or filter to one pod.
Reviewed-on: #395
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent
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