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Alerting ensures you know when ClickHouse performance drops or errors occur. Using Spring Boot monitoring and external tools, you can set alerts easily.

1. Expose Metrics with Actuator

Enable Actuator in application.properties: 
management.endpoints.web.exposure.include=health,metrics
management.endpoint.health.show-details=always
This gives you endpoints for health and metrics.

2. Add Key Metrics

Monitor critical areas:
  • Connection pool usage (hikaricp.connections.active)
  • Query execution time
  • Error counts
  • Disk or memory usage (via system metrics)

3. Integrate with Prometheus

Prometheus can scrape Actuator metrics. Add Prometheus registry: 
<dependency>
  <groupId>io.micrometer</groupId>
  <artifactId>micrometer-registry-prometheus</artifactId>
</dependency>
Configure Prometheus to scrape /actuator/prometheus.

4. Create Alert Rules

In Prometheus, define rules: 
- alert: HighQueryLatency
  expr: clickhouse_query_time_ms > 500
  for: 1m
  labels:
    severity: warning
  annotations:
    description: "Queries taking longer than 500ms"

5. Send Alerts

Connect Prometheus to Alertmanager, then forward alerts via:
  • Email
  • Slack
  • PagerDuty

6. Automate Health Checks

Spring Boot health indicators can trigger alerts if ClickHouse is unreachable: 
GET /actuator/health
If status is DOWN, Alertmanager sends notification.
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