feat(monitoring): add Grafana dashboard for ClickHouse

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- 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

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ddadmin committed 2026-02-08 20:29:43 +03:00

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commit fdeb48fdb2

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configs/grafana/provisioning/dashboards/clickhouse-overview.json

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