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bugfix sort after merging histogram metrics#7380

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Shvejan wants to merge 1 commit intocortexproject:masterfrom
Shvejan:master
Open

bugfix sort after merging histogram metrics#7380
Shvejan wants to merge 1 commit intocortexproject:masterfrom
Shvejan:master

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@Shvejan
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@Shvejan Shvejan commented Mar 26, 2026

What this PR does:
Add sort.Slice() to sort buckets by UpperBound in ascending order after building from the map. This matches the Prometheus client library's approach:

Which issue(s) this PR fixes:
Fixes #7379

Checklist

  • Tests updated
  • Documentation added
  • CHANGELOG.md updated - the order of entries should be [BUGFIX]

Signed-off-by: Shvejan Mutheboyina <shvejan@amazon.com>
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Bug: mergeHistogram produces non-deterministic bucket order causing flaky tests

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