deltatocumulative: Fix selection of the target scale for exponential histograms #37432
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Description
While addressing comments a bug was added to the logic of calculating of the desired scale and it slipped through tests.
Fix the bug (use
min
instead ofmax
) and update tests to avoid regressions in the future.Link to tracking issue
Fixes #37416
Testing
Update tests to separately cover positive and negative buckets.
Documentation
n/a