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Return a kNotFound status from contention profile conversion when synchronization profiling is disabled. - #1796

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Return a kNotFound status from contention profile conversion when synchronization profiling is disabled.

When the synchronization profile period is set to zero, both cumulative and delta contention profile conversion previously encoded an empty profile proto, causing callers to respond with HTTP 200 and an empty payload rather than HTTP 404.

Expose the recorded sampling period on DeltaContentionProfile and return a not-found error from CollectContentionProto and MakeDeltaContentionProfile whenever the sampling period is non-positive. Add HTTP handler tests covering disabled cumulative and delta contention requests.

Co-authored-by: Chris Kennelly ckennelly@google.com

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…ynchronization profiling is disabled.

When the synchronization profile period is set to zero, both cumulative and delta contention profile conversion previously encoded an empty profile proto, causing callers to respond with HTTP 200 and an empty payload rather than HTTP 404.

Expose the recorded sampling period on `DeltaContentionProfile` and return a not-found error from `CollectContentionProto` and `MakeDeltaContentionProfile` whenever the sampling period is non-positive. Add HTTP handler tests covering disabled cumulative and delta contention requests.

Co-authored-by: Chris Kennelly <ckennelly@google.com>
PiperOrigin-RevId: 1011438945

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