Replace status apps with Prometheus monitoring#266
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Use kube-prometheus-stack, Grafana, Alertmanager, and blackbox exporter probes as the compact monitoring surface for the homelab. This removes Gatus/Homepage-specific route metadata and policy requirements while keeping actionable Telegram alerting and routed-service checks in GitOps.
Keep the monitoring replacement diff focused by restoring the existing blank-line grouping in app values files after removing the Gatus and Homepage annotations.
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Let cert-manager and Argo CD own their native metrics ServiceMonitor resources instead of defining those scrapes from kube-prometheus-stack. This keeps kube-prometheus-stack focused on selecting monitoring CRs while app charts expose their own metrics integration.
Add a Grafana sidecar dashboard for blackbox probe health, failures, latency, and HTTP status codes so the new routed, DNS, and connectivity checks have a first-class visual surface.
Use a boolean comparison for the failing probe stat so failed probes count as one instead of summing zero-valued series. Also remove a table column for a probe label that is not reliably produced by Prometheus Operator Probe targets.
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Summary
Test Plan
Manual Verification After Merge