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Adding Health Checks to Spring Boot with Custom Indicators
- Spring Boot applications use the health indicator system to monitor the app's health without depending on manual checks.
- Health indicators feed data into the /actuator/health endpoint, checking database, message broker, and file system status.
- Spring Boot auto-configures health contributors based on the application context and classpath, like DataSourceHealthIndicator.
- Contributors like DiskSpaceHealthIndicator, MongoHealthIndicator, etc., register based on their prerequisite beans' presence.
- When a request hits /actuator/health, Spring combines all contributors' statuses into a JSON response.
- Custom health indicators implementing HealthIndicator interface can be easily integrated into Spring Boot for tailored monitoring, such as checking external systems.
- Profile-based activation and property control help in managing when custom indicators are active.
- Spring Boot supports liveness and readiness checks through /actuator/health/liveness and /actuator/health/readiness endpoints.
- Health checks communicating with remote services should use non-blocking calls like Spring's WebClient to avoid delays.
- Spring Boot's health indicator structure integrates seamlessly with Actuator, automating health monitoring and reporting for better system monitoring.
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