Spring Boot Actuator
Production-ready monitoring and management features for Spring Boot applications — exposes HTTP endpoints for health checks, metrics, environment info, thread dumps, and application management. Actuator endpoints: /actuator/health (liveness/readiness probes), /actuator/metrics (Micrometer metrics), /actuator/info (app metadata), /actuator/env (environment properties), /actuator/loggers (runtime log level changes), /actuator/threaddump, /actuator/heapdump. Health indicators: DataSource, Redis, Elasticsearch, and custom HealthIndicator for agent service dependencies. Kubernetes integration: /actuator/health/liveness and /actuator/health/readiness for separate probe endpoints. Metrics exposed to Prometheus, Datadog, and other backends via Micrometer.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
CRITICAL security concern: /actuator/env exposes all configuration properties including agent API keys and database passwords (partially masked by default but can be unmasked); /actuator/heapdump exposes full heap including secrets. Secure ALL actuator endpoints in production. Use Spring Security to restrict access. Disable sensitive endpoints (env, heapdump, threaddump) unless actively needed.
⚡ Reliability
Best When
Every Spring Boot agent service in production — Actuator is a must-have for Kubernetes health probes, Prometheus metrics, and operational visibility into running agent services.
Avoid When
There is no scenario to avoid Actuator — include it in every Spring Boot agent service. Secure endpoints appropriately but never disable.
Use Cases
- • Kubernetes health probes for agent service — /actuator/health/liveness (is process healthy?) and /actuator/health/readiness (is agent service ready for traffic?) as separate K8s probeHttpGet paths; Spring Boot 2.3+ configures both automatically
- • Agent dependency health monitoring — custom HealthIndicator checks LLM API availability; AgentLlmHealthIndicator implements HealthIndicator { return pingLlm() ? Health.up() : Health.down().withDetail('reason', error) } surface as /actuator/health component
- • Agent service Prometheus metrics — management.endpoints.web.exposure.include=health,metrics,prometheus exposes /actuator/prometheus; Micrometer auto-instruments agent request counts, timing, and JVM metrics for Prometheus scraping
- • Dynamic log level for agent debugging — POST /actuator/loggers/com.example.agent body {"configuredLevel":"DEBUG"} enables debug logging for agent package at runtime without restart; essential for production agent issue investigation
- • Agent build info endpoint — management.info.git.mode=full with git-commit-id-plugin exposes /actuator/info with Git commit, branch, and build time; agent deployment verification and version tracking
Not For
- • APM and distributed tracing — Actuator exposes local metrics and health; for distributed agent request tracing across microservices, use Spring Cloud Sleuth + Zipkin or OpenTelemetry
- • Custom dashboards — Actuator exposes data; for agent dashboard UI, use Grafana + Prometheus consuming /actuator/prometheus or Spring Boot Admin server aggregating multiple Actuator endpoints
- • Business metrics — Actuator auto-instruments technical metrics; for agent business KPIs (tasks completed, LLM tokens used), create custom Micrometer metrics and add to Actuator
Interface
Authentication
Actuator endpoints secured via Spring Security. Expose only /health publicly; protect /env, /loggers, /heapdump with authentication. Use management.endpoint.env.enabled=false for sensitive endpoints in production.
Pricing
Spring Boot Actuator is Apache 2.0 licensed, part of Spring Boot. Free for all use.
Agent Metadata
Known Gotchas
- ⚠ Actuator endpoints not exposed by default — Spring Boot 2.x exposes only /health and /info by default; management.endpoints.web.exposure.include=* or explicit list required for Prometheus, metrics, loggers; agent K8s deployments failing Prometheus scraping usually have /prometheus not exposed in actuator config
- ⚠ Separate management port recommended for production — management.server.port=8081 separates Actuator from agent API traffic; Kubernetes health probes hit management port while agent traffic uses 8080; prevents health probe traffic from appearing in agent API metrics and allows different firewall rules
- ⚠ Custom HealthIndicator affects overall health status — if custom AgentLlmHealthIndicator returns DOWN, /actuator/health aggregate status is DOWN; Kubernetes readiness probe sees DOWN and stops routing traffic to agent pod; make external dependency checks ADVISORY for optional dependencies using HealthContributorRegistry
- ⚠ Heapdump and threaddump expose sensitive data — /actuator/heapdump dumps full JVM heap including agent in-memory secrets, user data, and LLM API keys; /actuator/threaddump shows all threads with stack traces; these endpoints MUST be secured or disabled in production agent services
- ⚠ management.endpoint.health.show-details controls info exposure — show-details: always exposes health component details publicly; show-details: when-authorized requires authentication to see details; never-authorize reveals only UP/DOWN status; set to when-authorized for agent production health endpoints to hide internal component state from public
- ⚠ Micrometer metrics require explicit dependency — Spring Boot Actuator includes Micrometer core but not exporters; micrometer-registry-prometheus must be added as separate dependency for /actuator/prometheus endpoint; agent observability setup incomplete without explicit registry dependency despite Actuator being present
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Spring Boot Actuator.
Scores are editorial opinions as of 2026-03-06.