Sliding Sync: Add more tracing (#17514)

Spawning from looking at a couple traces and wanting a little more info. Follow-up to github.com//pull/17501 The changes in this PR allow you to find slow Sliding Sync traces ignoring the `wait_for_events` time. In Jaeger, you can now filter for the `current_sync_for_user` operation with `RESULT.result=true` indicating that it actually returned non-empty results. If you want to find traces for your own user, you can use `RESULT.result=true ARG.sync_config.user="@MadLittleMods:matrix.org"`
element-hq · Aug 6, 2024 · 1dfa59b · 1dfa59b
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diff --git a/changelog.d/17514.misc b/changelog.d/17514.misc
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+Add more tracing to experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint.