ddmitry/clickstream-ch-kafka-superset-demo
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3 Commits
Author SHA1 Message Date
ddadmin 8a6306954e fix(monitoring): use delta() instead of rate() for CPU gauge metric 
Fix Grafana warning about using rate() on gauge metric:
- ClickHouseProfileEvents_OSCPUVirtualTimeMicroseconds is a gauge, not counter
- rate() should only be used with counters; using delta() instead
- Add explicit datasource block for consistency

API verified via Context7:
- /prometheus/docs: rate() should never be used on gauges
 2026-02-08 22:48:36 +03:00
ddadmin 5270273d8a feat(monitoring): add Grafana alert rules and fix datasource binding 
- Why:
  - dashboard panels could resolve to stale datasource uid and show No data
  - monitoring required proactive alerts for ClickHouse health signals
- What:
  - pin dashboard panels to prometheus_uid and remove datasource templating variable
  - fix PromQL metrics for CPU, inserted rows, and parts panels
  - add provisioning alert rules for failed queries, memory resident, and active parts
  - pin Prometheus datasource uid and update monitoring documentation
- Check:
  - POST /api/admin/provisioning/datasources/reload
  - POST /api/admin/provisioning/dashboards/reload
  - POST /api/admin/provisioning/alerting/reload
  - GET /api/v1/provisioning/alert-rules
 2026-02-08 20:49:31 +03:00
ddadmin fdeb48fdb2 feat(monitoring): add Grafana dashboard for ClickHouse 
- Add Prometheus datasource provisioning config
- Add Grafana dashboard provider configuration
- Add ClickHouse Overview dashboard (JSON)
- Update README.md with monitoring section and updated stack badge
- Update docs/OPERATIONS.md with monitoring runbook

Dashboard includes:
- System Health: CPU, Memory Resident, Memory Code
- Query Performance: queries/sec, active queries, failed queries
- MergeTree Storage: parts count, merge rate

Verified via Context7: ClickHouse Prometheus metrics use ClickHouseAsyncMetrics_*,
ClickHouseMetrics_*, ClickHouseProfileEvents_* prefixes in v25.1.

Access:
- Grafana: http://localhost:3000 (admin/admin)
- Prometheus: http://localhost:9090
 2026-02-08 20:29:43 +03:00