Spring Boot 4 observability with Actuator, Micrometer, and OpenTelemetry. Use when configuring health indicators, health checks, custom metrics, distributed tracing, production endpoint exposure, Kubernetes probes, Cloud Run probes, logging, or monitoring. Covers Actuator endpoint security, Micrometer Timer/Counter/Gauge patterns, OpenTelemetry span customization, liveness/readiness probe setup, and metric tag best practices.
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See how to installReview the instructions the agent will receive before you install.
Production observability with Actuator endpoints, Micrometer metrics, and OpenTelemetry tracing.
| 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) |
actuator, micrometer-registry-*, opentelemetrySee EXAMPLES.md for complete working examples including:
org.springframework.boot.health.contributor.*access: none/unrestricted/read-only| 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 |
| Need | Skill |
|---|---|
| Dependency validation | spring-boot-verify |
| Actuator security | spring-boot-security |
| Actuator testing | spring-boot-testing |
| Module metrics | spring-boot-modulith |
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Create, review, and manage Architecture Decision Records (ADRs) with auto-numbering, template detection, quality review, and index maintenance. Use when user mentions "ADR", "architecture decision", "document this decision", "create ADR", "review ADR", editing ADR files (docs/adr/, doc/adr/, .adr/), or discussing architectural choices and tradeoffs.
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Analyze system architecture, module structure, API contracts, data models, and code patterns. Use when designing systems, reviewing module boundaries, evaluating API designs, analyzing data models, checking pattern conformance, tracing decisions, or reviewing frontend architecture. Triggers: "architecture", "module design", "API design", "data model", "boundaries", "patterns", "decisions", "frontend architecture".
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Converts natural-language descriptions or UI spec files into optimized Google Stitch prompts. Use when creating, refining, or validating design directives for Google Stitch. Use when user says "create a Stitch prompt", "optimize this for Stitch", "convert this spec to a Stitch prompt", "write a UI prompt", or mentions Google Stitch prompt authoring. Follows Stitch best practices with short, directive prompts focused on screens, structure, and visual hierarchy.
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Zero-dependency live-preview server providing an agent↔browser bidirectional companion. Watches a content directory, wraps HTML fragments in a frame template, broadcasts live-reload over WebSocket, and captures browser-side click events to a JSONL file. Use when an agent needs to show HTML to the user in a browser and react to clicks — mockups, design exploration, gallery browsing, multi-select choices, prototype iteration. Triggered by "live preview", "browser companion", "preview server", "browser mockup", "show in browser", "arkhe-preview", or any skill that wants to write HTML fragments and have the user see them reload in real time.
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Deletes merged git branches (local and remote) and flags stale unmerged branches for manual review. Use when user mentions "cleanup branches", "delete merged branches", "prune old branches", "remove stale branches", "branch cleanup", or runs /cleanup-branches command.
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Interactive Claude Code environment setup wizard. Detects existing configuration, guides through best-practice setup for Global CLAUDE.md, project scaffolding, MCP servers, hooks, custom agents, keybindings, and settings. Use when user runs /devtools:code-env-setup, mentions "setup claude code", "configure claude", "claude code setup", "environment setup", or "initialize claude code".
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