feat(metrics): [Trace Metrics 23] Add E2E tests for Metrics

[adinauer]

📜 Description

💡 Motivation and Context

💚 How did you test it?

📝 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

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

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## Unreleased

### Features

- [Trace Metrics 23] Add E2E tests for Metrics ([#5011](https://github.com/getsentry/sentry-java/pull/5011))

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[adinauer]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• feat(metrics): [Trace Metrics 28] Use MeasurementUnit for Metrics #5022
• feat(metrics): [Trace Metrics 27] Automatically use SentryOptions.Metrics.BeforeSendMetricCallback Spring beans #5021
• feat(metrics): [Trace Metrics 26] SentryMetricsParameters create shortcut for attributes map #5020
• feat(metrics): [Trace Metrics 25] Add Hint to Metrics #5019
• feat(metrics): [Trace Metrics 24] PR Feedback #5013
• feat(metrics): [Trace Metrics 23] Add E2E tests for Metrics #5011 👈 (View in Graphite)
• feat(metrics): [Trace Metrics 22] Close and flush MetricsBatchProcessor from SentryClient #5010
• Use uv for managing python version #5009
• feat(metrics): [Trace Metrics 21] Add AI rules files for Metrics (and update feature flags rule) #5008
• feat(metrics): [Trace Metrics 20] Add device and OS attributes to metrics #5007
• feat(metrics): [Trace Metrics 19] Create SentryMetricsParameters for Metrics #5006
• feat(metrics): [Trace Metrics 18] Add unit tests for Metrics #5005
• feat(metrics): [Trace Metrics 17] Remove Experimental Annotation from Metrics Options #4996
• feat(metrics): [Trace Metrics 16] Only send user attributes if sendDefaultPii is true #4995
• feat(metrics): [Trace Metrics 15] Android Metrics batch processor and factory #4994
• feat(metrics): [Trace Metrics 14] Metrics Manifest options for Android #4993
• feat(metrics): [Trace Metrics 13] Metrics external options #4992
• feat(metrics): [Trace Metrics 12] Record client report for discarded metrics envelope item #4991
• feat(metrics): [Trace Metrics 11] Metrics Envelope item deserialization #4990
• feat(metrics): [Trace Metrics 10] Metrics Gauge API #4989
• feat(metrics): [Trace Metrics 9] Metrics Distribution API #4988
• feat(metrics): [Trace Metrics 8] Metrics Count API #4987
• feat(metrics): [Trace Metrics 7] Metrics counter basic API #4986
• feat(metrics): [Trace Metrics 6] Implement SentryClient for Metrics #4985
• feat(metrics): [Trace Metrics 5] Add batch processor for Metrics #4984
• feat(metrics): [Trace Metrics 4] Add transport types for metrics #4983
• feat(metrics): [Trace Metrics 3] Enable metrics by default #4982
• feat(metrics): [Trace Metrics 2] MetricsApi stub #4981
• feat(metrics): [Trace Metrics 1] Metrics Options #4980
• main

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Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	307.45 ms	374.04 ms	66.59 ms
Size	1.58 MiB	2.20 MiB	635.31 KiB

Previous results on branch: 01-08-add_e2e_tests_for_metrics

Startup times

Revision	Plain	With Sentry	Diff
527a476	352.67 ms	429.67 ms	77.00 ms

App size

Revision	Plain	With Sentry	Diff
527a476	1.58 MiB	2.13 MiB	561.00 KiB

[markushi]

LGTM!

[markushi]

Could we move this inside TestHelper.ensureMetricsReceived()? At least I see quite some sleep calls in there and if we ever decide to refactor this it would make it easier to have all sleep calls in one place.

[markushi]

nit, since it's just sample code 🙈

Suggested change

	@GetMapping("gauge/{count}")
	String gauge(@PathVariable Long count) {
	Sentry.metrics().gauge("memory.free", count.doubleValue(), "byte");
	@GetMapping("gauge/{value}")
	String gauge(@PathVariable Long value) {
	Sentry.metrics().gauge("memory.free", value.doubleValue(), "byte");