- Зачем:
- нужна визуализация метрик generator в реальном времени
- Prometheus job уже настроен, не хватает Grafana dashboard
- Что:
- добавлен provisioning-файл dashboards/generator-overview.json
- 6 разделов: Overview, Events by Topic, Errors, Tick Statistics, Status, Info
- Overview: Total Events/min (все 4 топика), Tick Duration (p50/p99)
- Events by Topic: bar chart Events per Hour, Events Rate, Total Events
- Errors: Total Errors, Error Rate, Errors by Topic (с 'or on() vector(0)')
- Tick Statistics: Duration Distribution, Hour Factor (text), Tick Interval (text)
- Status: Generator Status (threshold 120s), Generator Health (heartbeat), Time Since Last Tick
- Info: команды и предупреждения о хардкоде GEN_TICK_SECONDS=5s
- исправлены панели ошибок с 'or on() vector(0)' для корректного отображения 0
- заменен heatmap на bar chart для стабильности
- добавлены пояснения про Events/min = сумма 4 связанных топиков
- Hour Factor синхронизирован с кодом генератора (00-05/09-18)
- Generator Health: переименовано из State Management с value mappings
- обновлены docs/OPERATIONS.md и generator/README.md
- удален устаревший plans/generator-monitoring-plan.md
- Проверка:
- дашборд открывается на http://localhost:3000/d/generator-overview
- все панели отображают данные корректно (протестировано через Playwright)
- ошибки показывают 0 вместо No data
- Events/min корректно отображает сумму всех 4 топиков (~800-1000/min)
- Add port 9126 mapping for ClickHouse Prometheus metrics endpoint
(was configured in prometheus_ch.xml but not exposed in docker-compose.yml)
- Fix CPU Usage panel: use delta() instead of rate() for gauge metric
ClickHouseProfileEvents_OSCPUVirtualTimeMicroseconds is a gauge, not counter
- Add explicit datasource blocks to dashboard queries for consistency
ClickHouse ProfileEvents metrics correctly use rate() — they are counters.
Warning about missing _total suffix is expected (ClickHouse naming convention).
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
- Add statsd-exporter service to docker-compose.yml (prom/statsd-exporter:v0.27.1)
- Add StatsD env vars to airflow-default-env for metrics export
- Add airflow job to prometheus.yml scrape configs
- Add Airflow Overview dashboard (Grafana provisioning)
- Add Airflow alert rules: scheduler down, queue backlog, failures, parse time
- Add configs/statsd_mapping.yml for StatsD → Prometheus conversion
- Use Prometheus naming convention (_total for counters, _seconds for timers)
- Add monitoring plan at plans/monitoring_airflow_plan.md
- Update OPERATIONS.md and Makefile for airflow monitoring
Tested: all 3 jobs (airflow, clickhouse, kafka) showing UP in Prometheus,
metrics flowing (dagbag_size=3, executor slots, heartbeats with _total suffix),
all 4 alert rules loaded in Grafana
- Why:
- dashboard showed offset as throughput and produced misleading values
- kafka-exporter metric/label naming was inconsistent across alerts/docs
- consumer-group-missing alert was noisy for demo runs
- What:
- switch throughput panel to rate(kafka_topic_partition_current_offset[5m]) aggregated by topic and exclude __* topics
- align lag metric/labels to kafka_consumergroup_lag + consumergroup
- remove Kafka Consumer Group Missing alert from provisioning
- pin kafka-exporter image to v1.9.0 and update OPERATIONS.md checks
- Check:
- airflow dags list-import-errors -> No data found
- Prometheus targets: clickhouse up, kafka up
- PromQL kafka_consumergroup_lag returns series
- Grafana dashboards provisioning reload returns success
- Add kafka-exporter service to docker-compose.yml
- Add kafka job to prometheus.yml scrape configs
- Add Kafka Overview dashboard (Grafana provisioning)
- Add Kafka alert rules (broker down, consumer lag, etc.)
- Add make reload-monitoring command for easy updates
- Update OPERATIONS.md with TL;DR and troubleshooting
API verified via Context7:
- /danielqsj/kafka_exporter for exporter config
- /prometheus/docs for scrape_configs format
- 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
ddadminandDmitry Dementiev