feat(micrometer): Add Micrometer metrics integration

[adinauer]

PR Stack (Micrometer)

• feat(micrometer): Add Micrometer metrics integration #6084
• feat(micrometer): [Micrometer 1] Add active meters #6085

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📜 Description

Collection branch for the Micrometer metrics integration stack.

The stack adds a framework-neutral sentry-micrometer registry, active and passive meter mappings, separately reviewed FunctionTimer semantics, and opt-in Spring Boot 2, 3, and 4 auto-configuration.

💡 Motivation and Context

Micrometer users currently need custom code to send application metrics to Sentry. This stack makes Sentry an additional Micrometer destination while preserving existing registries and reusing the SDK's metrics pipeline.

💚 How did you test it?

Each stack PR includes focused tests for the capability it introduces. The final PR adds cross-registry and Spring Boot validation.

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

Merge the stack PRs bottom-to-top using merge commits, then squash-merge this collection PR into main.

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Features

- Add Micrometer metrics integration ([#6084](https://github.com/getsentry/sentry-java/pull/6084))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description or adding a skip-changelog label.

Generated by 🚫 dangerJS against 2b6abbb

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.56.0 (1)	release

⚙️ sentry-android Build Distribution Settings