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Emilien Macchi b8ac729a15 feat(server): add gateway capacity metrics and optional HPA
Expose per-replica supervisor sessions, pending relay capacity, relay
rejections and claim latency, and outbound peer request outcomes and
latency. Use bounded labels and Prometheus histograms for the new latency
metrics while preserving existing summary metrics.

Add an optional Helm HPA with external-database and resource validation,
conservative scale-down defaults, and support for custom metrics. Keep
certificate hook pods outside gateway workload selectors.

Document per-pod scraping, scaling limits, upgrade behavior, and
PostgreSQL connection sizing.

Part of #3528

Signed-off-by: Emilien Macchi <emacchi@redhat.com>
2026-10-01 18:56:04 -04:00
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