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Chris LuandGitHub
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* telemetry: persist server state across restarts The telemetry server kept the instance map and Prometheus gauges only in process memory, so every deploy or restart reset all collected metrics until clusters re-reported over the next 24h. Snapshot the instance map to a JSON state file (atomic tmp+rename) on a debounced interval and on SIGTERM, and restore it on startup, preserving received_at so the cleanup and active-cluster windows stay correct. Defaults to data/telemetry-state.json, which the deployed systemd unit's WorkingDirectory already provides; -state-file='' disables. * telemetry: keep instances for 90 days by default With state now persisted across restarts, a longer retention default is meaningful; raise -max-age from 30 to 90 days so per-cluster data survives long enough for quarterly views.