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spring-boot-observability

@joaquimscosta/arkhe-claude-plugins
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Spring Boot 4 observability with Actuator, Micrometer, and OpenTelemetry. Use when configuring health indicators, custom metrics, distributed tracing, production endpoint exposure, or Kubernetes/Cloud Run probes. Covers Actuator security, Micrometer Timer/Counter/Gauge patterns, and OpenTelemetry span customization.

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SKILL.md

name spring-boot-observability
description Spring Boot 4 observability with Actuator, Micrometer, and OpenTelemetry. Use when configuring health indicators, custom metrics, distributed tracing, production endpoint exposure, or Kubernetes/Cloud Run probes. Covers Actuator security, Micrometer Timer/Counter/Gauge patterns, and OpenTelemetry span customization.

Spring Boot Observability

Production observability with Actuator endpoints, Micrometer metrics, and OpenTelemetry tracing.

Core Components

Component Purpose
Actuator Health checks, info, metrics exposure, operational endpoints
Micrometer Metrics abstraction (Timer, Counter, Gauge, DistributionSummary)
OpenTelemetry Distributed tracing (default in Spring Boot 4)

Core Workflow

  1. Add starters → actuator, micrometer-registry-*, opentelemetry
  2. Configure endpoint exposure → Secure sensitive endpoints
  3. Define health groups → Separate liveness from readiness
  4. Add custom metrics → Business-specific measurements
  5. Configure tracing → Sampling, propagation, export

Quick Patterns

See EXAMPLES.md for complete working examples including:

  • Production Actuator Configuration with health groups and Kubernetes probes
  • Custom Health Indicator with latency monitoring (Java + Kotlin)
  • Custom Micrometer Metrics with Counter, Timer, and Gauge patterns
  • OpenTelemetry Span Customization with Observation API
  • OpenTelemetry Configuration for OTLP export
  • Actuator Endpoint Access Control (Boot 4)

Spring Boot 4 Specifics

  • OpenTelemetry is the default tracer (replaces Brave)
  • Health Indicator imports from org.springframework.boot.health.contributor.*
  • Endpoint Access Control with access: none/unrestricted/read-only

Detailed References

Anti-Pattern Checklist

Anti-Pattern Fix
DB checks in liveness probe Move to readiness group only
100% trace sampling in production Use 10% or less
Exposing all endpoints publicly Separate management port + auth
High-cardinality metric tags Use low-cardinality tags only
Missing graceful shutdown Add server.shutdown=graceful
No health probe groups Separate liveness and readiness

Critical Reminders

  1. Separate liveness from readiness — Liveness: "is process alive?", Readiness: "can handle traffic?"
  2. Low cardinality tags only — User IDs, request IDs = bad; status codes, regions = good
  3. Secure Actuator endpoints — Use separate port or authentication
  4. Sample traces in production — 100% sampling overwhelms collectors
  5. Graceful shutdown — Allow in-flight requests to complete