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How the Mechanics of Spring Boot Actuator Health Indicators Work
- Spring Boot Actuator automatically activates health indicators based on specific dependencies and integrates them with the /actuator/health endpoint.
- Health indicators are registered through Spring Boot’s auto-configuration classes using ConditionalOnClass and ConditionalOnBean annotations.
- The HealthContributorRegistry is a centralized registry that manages all health contributors (indicators and aggregators).
- When a health check is triggered, the HealthEndpoint retrieves all registered contributors from the HealthContributorRegistry and evaluates their status.
- Custom health indicators are implemented by creating a class that implements the HealthIndicator interface. These are automatically registered through Spring Boot when annotated with @Component or defined as a @Bean.
- The /actuator/health endpoint aggregates information from all registered HealthIndicator beans and displays their statuses. Developers can control which indicators are included or excluded.
- HTTP status codes returned by the health endpoint can be mapped to specific health statuses. Sensitive details in health responses can be selectively included or excluded.
- Overall, Spring Boot Actuator’s health indicators provide default and custom functionality to monitor specific components and resources, and can be customized to meet specific requirements.
- The framework’s architecture provides a structured yet adaptable way to monitor applications using predefined capabilities with developer-defined logic.
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