cherry-pick #9346 to v1.82.x - #9368
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… tests (grpc#9346) Tests in `stats/opentelemetry` and `stats/opentelemetry/csm` asserted a hardcoded compressed message size of `57` bytes for a 10,000-byte zero payload with gzip compression. In Go 1.27, standard library `compress/gzip` compression improvements changed the output size of this payload from 57 bytes to 54 bytes, causing metric and trace size assertions to fail when executed under newer Go toolchains. Added `GzipCompressedMessageSize` helper in to compute the expected compressed byte length dynamically via `compress/gzip`. Updated metric and trace assertions to use the same. RELEASE NOTES: None
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## v1.82.x #9368 +/- ##
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+ Coverage 83.20% 87.46% +4.26%
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Files 418 418
Lines 33764 28972 -4792
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- Hits 28094 25341 -2753
+ Misses 4253 3630 -623
+ Partials 1417 1 -1416
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mbissa
approved these changes
Aug 25, 2026
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Original PR : #9346
RELEASE NOTES: None