Sven c9084f0586 feat: add Prometheus metrics shim for Indiekit process monitoring ...

Preloads metrics-shim.cjs via `node --require` into the Indiekit process
so heap, GC, event loop lag, CPU and handle metrics are exposed at
:9209/metrics for Prometheus scraping. Uses prom-client collectDefaultMetrics.

- Add metrics-shim.cjs (prom-client HTTP server, port 9209)
- Add prom-client ^15.1.3 to dependencies
- Wire --require ./metrics-shim.cjs into start.example.sh and npm serve script
- Grafana: NodeJS Application Dashboard (11159) at console.giersig.eu

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-28 16:06:21 +01:00

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