Spring Boot’s operational and development tools solve different problems: Actuator exposes management endpoints and diagnostics, Micrometer connects application measurements to monitoring systems, DevTools improves the local edit-run cycle, and Docker Compose or Testcontainers can supply dependent services during development. These tools are not all enabled or exposed in the same way, and their configuration should be checked against the Spring Boot release used by your project.
What Spring Boot Actuator does
Actuator adds management and monitoring capabilities to a Spring Boot application. In a web application, enabled endpoints can be exposed over HTTP; the conventional URL combines the management base path with an endpoint ID. For example, the health endpoint is normally available at /actuator/health. See the Spring Boot HTTP monitoring and management reference.
An endpoint being available in the application is not the same as every endpoint being exposed over HTTP or safe for public access. Review which endpoints are enabled and which are exposed, and protect management access according to the application’s deployment and security model. Do not treat an Actuator URL as an unauthenticated public API simply because it follows the standard path.
Choose where management traffic runs
By default, management endpoints use the application’s web server and port. Setting management.server.port can place the management server on a separate port. Sharing the application port may suit cloud deployments, while a separate management port can be useful in some data-center setups. A separate port is a network-layout choice, not a substitute for access control.
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How to inspect Spring Boot metrics
Spring Boot integrates with Micrometer, which provides an instrumentation facade and registry integrations for monitoring systems such as Prometheus, OTLP, Datadog, New Relic, and Graphite. The available integrations depend on the registry dependencies and configuration in your application; naming a supported backend does not mean it is automatically active. Spring Boot can auto-configure registry implementations found on the classpath. The metrics reference describes the integration.
Use the metrics endpoint for diagnosis
The Actuator /actuator/metrics endpoint is a diagnostic view, not a substitute for a monitoring backend. It is not available by default: configure endpoint exposure before requesting it. When exposed, requesting the endpoint lists meter names; requesting a particular meter lets you inspect its measurements, and tags can narrow the result. Use the meter’s code-level name in the endpoint, even if a monitoring backend displays a normalized version of that name.
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- Expose the endpoint deliberately. Configure Actuator endpoint exposure for your chosen management interface and ensure access is appropriately restricted.
- List meters. Request
/actuator/metricson the configured management address. - Inspect a meter. Request
/actuator/metrics/{meter-name}, replacing the placeholder with the name returned by the listing. Add tag query parameters when you need to filter the measurement. - Configure a registry for ongoing monitoring. Add and configure the Micrometer registry for the backend you intend to use; the diagnostic endpoint alone does not set up backend export.
Inspection and monitoring are different jobs
Use the endpoint to answer targeted questions while diagnosing an application. For dashboards, alerting, and longer-term analysis, configure an appropriate registry and monitoring system. Those systems may represent meter names differently, so use the code-level meter name when querying Actuator and the backend’s own conventions when building queries there.
Where OpenTelemetry fits
Spring Boot’s Actuator module includes basic support for OpenTelemetry. The documented integration can provide an OpenTelemetry bean, register certain SDK provider beans, and provide a Resource bean whose attributes can be configured. Those building blocks do not mean every telemetry signal is automatically exported. See the Spring Boot observability reference.
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| Signal | What Spring Boot documents as automatic |
|---|---|
| Metrics | Spring Boot does not automatically export OpenTelemetry metrics. |
| Traces | Trace export is auto-configured only when Micrometer Tracing is present. |
| Logs | Spring Boot does not automatically export OpenTelemetry logs. |
Disabling Spring Boot’s OpenTelemetry support does not necessarily disable metrics functionality: Spring Boot does not use OpenTelemetry’s metrics functionality for that purpose. Treat OpenTelemetry SDK integration, Micrometer metrics, and signal export as related but distinct configuration decisions.
What Spring Boot DevTools does
DevTools is development-time convenience tooling. Keep it optional or in a development-only dependency scope rather than relying on it as part of production behavior. Spring Boot automatically disables DevTools when running a fully packaged application, such as one launched with java -jar. The Developer Tools reference also cautions that classloading issues can occur, especially in multi-module projects.
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If DevTools behaves unexpectedly in a multi-module build, investigate classloader boundaries and how the modules are launched before assuming the application code itself is at fault. Verify the dependency scope and launch mode when checking whether DevTools should be active.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Start dependent services during development
Spring Boot supports two development-time service approaches: Docker Compose and Testcontainers. Both help make application dependencies available during development, but they differ in how you describe and manage those services. Spring Boot’s development-time services reference documents these capabilities on the Spring Boot 4.0 reference path.
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| Approach | Configuration style | Typical fit |
|---|---|---|
| Docker Compose | Container-stack configuration, conventionally in a neighboring compose.yml. |
A local development environment with one or more containerized dependencies managed together. |
| Testcontainers | Java-based configuration; the documented example uses a test classpath. | Development services configured in code, particularly where test-oriented container setup fits the workflow. |
Both are intended as development-time support; development-time services are disabled after deployment. This keeps local service orchestration separate from the production deployment model.
Check release-specific behavior
The Actuator HTTP reference cited here identifies itself as Spring Boot 4.1.1, while the development-time services page is on a Spring Boot 4.0 reference path. The project’s exact target release is not specified here, so confirm property names, defaults, examples, and dependency setup in the reference documentation for your own Spring Boot version. The common application properties appendix is the reference for release-specific configuration keys and defaults.
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