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fix(sdk-metrics): preserve startTime for cumulative ExponentialHistograms #3934

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merged 3 commits into from
Jun 29, 2023

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aabmass
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@aabmass aabmass commented Jun 21, 2023

Which problem is this PR solving?

Fixes #3931

Short description of the changes

We were throwing away previous value's startTime. This updates to keep the older (previous) startTime when merging. See similar logic for Histograms: https://github.com/aabmass/opentelemetry-js/blob/b4fde50bb8e9848e70b1c9c2db5d6909741b422c/packages/sdk-metrics/src/aggregator/Histogram.ts#L154

Type of change

Please delete options that are not relevant.

  • Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Added a new integration/regression test. Updated the unit tests.

Checklist:

  • Followed the style guidelines of this project
  • Unit tests have been added

@aabmass aabmass force-pushed the starttimebugfix branch 2 times, most recently from 246c4ba to 2852cbf Compare June 21, 2023 21:03
@aabmass aabmass marked this pull request as ready for review June 21, 2023 21:07
@aabmass aabmass requested a review from a team as a code owner June 21, 2023 21:07
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codecov bot commented Jun 21, 2023

Codecov Report

Merging #3934 (929a683) into main (10c3e93) will increase coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head 929a683 differs from pull request most recent head 4c46fd5. Consider uploading reports for the commit 4c46fd5 to get more accurate results

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #3934      +/-   ##
==========================================
+ Coverage   92.90%   92.97%   +0.06%     
==========================================
  Files         297      297              
  Lines        8838     8839       +1     
  Branches     1815     1815              
==========================================
+ Hits         8211     8218       +7     
+ Misses        627      621       -6     
Impacted Files Coverage Δ
...sdk-metrics/src/aggregator/ExponentialHistogram.ts 98.11% <100.00%> (+0.95%) ⬆️

... and 1 file with indirect coverage changes

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@pichlermarc pichlermarc left a comment

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Looks good, thanks for fixing this 🙂
cc @mwear would you mind taking a look? 🙂

@pichlermarc pichlermarc added release:next-minor-version bug Something isn't working priority:p2 Bugs and spec inconsistencies which cause telemetry to be incomplete or incorrect labels Jun 22, 2023
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@mwear mwear left a comment

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LGTM, this was definitely an oversight. Thanks for finding and fixing @aabmass!

@pichlermarc pichlermarc merged commit e2e291c into open-telemetry:main Jun 29, 2023
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@aabmass aabmass deleted the starttimebugfix branch June 29, 2023 14:59
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Cumulative ExponentialHistogram resets start time each collection
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