feat(n8n): add Prometheus ServiceMonitor and PodMonitor#7624
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Add ServiceMonitor for n8n main instance and PodMonitor for n8n-worker to scrape /metrics on port 5678. Enables Prometheus to collect queue depth, execution duration, and error rate metrics.
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Summary
ServiceMonitorfor n8n main instance — scrapes/metricson porthttp(5678)PodMonitorfor n8n-worker — scrapes/metricson porthealth(5678, no Service exists for worker)release: prometheuslabel for Prometheus operator discoveryn8nnamespaceContext
n8n already has
N8N_METRICS=trueandN8N_METRICS_INCLUDE_QUEUE_METRICS=trueenabled (PR #7591), but Prometheus wasn't scraping the endpoint. This completes the observability item (#7) from #7590.Metrics exposed include queue depth, execution duration, error rates — ready for Grafana dashboards and alerting rules.
Test plan
kubectl apply --dry-run=clientpasseskubectl get servicemonitor,podmonitor -n n8nshows both resourcesn8n_metrics in Grafana to verify data collectionCloses observability item in #7590