feat(core): [Logs and Metrics Enable Flags 9] Remove Metrics enable flag

[adinauer]

PR Stack (Logs and Metrics Enable Flags)

• feat(core): Remove Logs and Metrics enable flags #5939
• feat(logback): [Logs and Metrics Enable Flags 1] Add Logs opt-in #5940
• feat(log4j2): [Logs and Metrics Enable Flags 2] Add Logs opt-in #5941
• feat(jul): [Logs and Metrics Enable Flags 3] Add Logs opt-in #5942
• feat(android): [Logs and Metrics Enable Flags 4] Add Timber Logs opt-in #5943
• feat(android): [Logs and Metrics Enable Flags 5] Add Logcat Logs opt-in #5945
• feat(spring): [Logs and Metrics Enable Flags 6] Add logging Logs opt-in for Spring Boot #5946
• feat(core): [Logs and Metrics Enable Flags 7] Remove Logs enable flag #5947
• perf(core): [Logs and Metrics Enable Flags 8] Avoid unused Logs worker thread #5952
• feat(core): [Logs and Metrics Enable Flags 9] Remove Metrics enable flag #5953
• perf(core): [Logs and Metrics Enable Flags 10] Avoid unused Metrics worker thread #5957
• fix(jul): [Logs and Metrics Enable Flags 11] Preserve null-message records #5960
• docs: [Logs and Metrics Enable Flags 12] Update options guidance #5961
• fix(android): [Logs and Metrics Enable Flags 13] Read Timber option lazily #5964
• ref(logging): [Logs and Metrics Enable Flags 14] Rename Logs opt-ins #5970

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📜 Description

Removes the aggregate Metrics enable option from SentryOptions.Metrics. Manual Sentry.metrics() calls now capture without an enable flag, and SentryClient always creates the configured Metrics batch processor.

Removes legacy metrics.enabled external configuration and io.sentry.metrics.enabled Android metadata. NoOpMetricsBatchProcessor remains available as a separate public API.

💡 Motivation and Context

Metrics are a manual namespaced API and no production integration currently generates them automatically. Requiring an aggregate enable option adds configuration without protecting users from automatic instrumentation.

💚 How did you test it?

• ./gradlew :sentry:test :sentry-android-core:testReleaseUnitTest
• ./gradlew spotlessApply apiDump
• Verified the configured Metrics batch processor is always created
• Verified the removed methods disappear from the core API dump

📝 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.

🔮 Next steps

Avoid starting the Metrics batch worker thread until it is first needed.

⚠️ Merge this PR using a merge commit (not squash). Only the collection branch is squash-merged into 9.x.x.

[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

- [Logs and Metrics Enable Flags 9] Remove Metrics enable flag ([#5953](https://github.com/getsentry/sentry-java/pull/5953))

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 a1e848a

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.58.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	312.54 ms	354.06 ms	41.52 ms
Size	0 B	0 B	0 B

Baseline results on branch: perf/logs-batch-thread-first-use

Startup times

Revision	Plain	With Sentry	Diff
31a945a	307.74 ms	351.86 ms	44.11 ms

App size

Revision	Plain	With Sentry	Diff
31a945a	0 B	0 B	0 B

Previous results on branch: feat/remove-metrics-enable-flag

Startup times

Revision	Plain	With Sentry	Diff
aceb315	315.40 ms	346.49 ms	31.09 ms

App size

Revision	Plain	With Sentry	Diff
aceb315	0 B	0 B	0 B

[lbloder]

LGTM 👍

[lbloder]

Do we still need the NoOpMetricsBatchProcessor?

[adinauer]

Removed NoOpMetricsBatchProcessor in a1e848a. It had no remaining SDK call sites after removing the aggregate Metrics enable flag; supported suppression remains available through beforeSendMetric.