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docs(apple): Explain MetricKit hang diagnostics - #20022

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Expand the MetricKit documentation to explain system-provided hang diagnostics, how to interpret sampled flame graphs, and the limits of default reporting. Include Swift and SentryObjC configuration for experimental flame graph attachments, with attachment quota, symbolication, fallback, and raw payload guidance.

This is an early draft tied to the implementation PRs below. Legacy reporting remains the default. The draft distinguishes aggregate samples from time-based profiles and does not promise culprit identification or improved grouping, which these implementations do not provide. Release availability and final limits need review before publication.

Related implementation PRs:

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  • PR was reviewed and approved by any necessary SMEs (subject matter experts)
  • PR was reviewed and approved by a member of the Sentry docs team

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vercel Bot commented Oct 16, 2026 •

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linear-code Bot commented Oct 16, 2026

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COCOA-2073

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