Viktor Barzin 725fefe565 fix: add Headscale monitoring, alerts, and pin UI image ... - Add 4 Prometheus alerts: HeadscaleDown (critical), NoOnlineNodes, HighHTTPLatency, HighErrorRate - Add Grafana dashboard with node count, map responses, HTTP latency, nodestore operations, and memory panels - Pin headscale-ui to digest sha256:015f5ba0... (was :latest) - Set disable_check_updates: true to skip GitHub check on startup - Uptime Kuma monitor already existed (id=19, 300s interval)		2026-03-28 16:07:04 +02:00
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monitoring	fix: add Headscale monitoring, alerts, and pin UI image	2026-03-28 16:07:04 +02:00