feat(observability): add Grafana with provisioned datasources and dashboards
Add obs-grafana service (grafana/grafana-oss:11.6.1) to docker-compose.observability.yml. Datasources (Prometheus, Loki, Tempo) are auto-provisioned via infra/observability/grafana/provisioning/datasources/datasources.yml with cross-datasource linking (Loki traceId → Tempo, Tempo → Loki, service map via Prometheus). Three dashboards are pre-loaded: Node Exporter Full (1860), Spring Boot Observability (17175), Loki Logs (13639) — datasource template variables replaced with provisioned UIDs. GRAFANA_ADMIN_PASSWORD added to .env.example. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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@@ -35,6 +35,9 @@ PORT_GRAFANA=3001
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PORT_GLITCHTIP=3002
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PORT_PROMETHEUS=9090
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# Grafana admin password — change this before exposing Grafana beyond localhost
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GRAFANA_ADMIN_PASSWORD=changeme
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# GlitchTip domain — production: use https://grafana.raddatz.cloud (must match Caddy vhost)
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GLITCHTIP_DOMAIN=http://localhost:3002
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