8000 [bugfix] fix avg_over_time & compare queries panic with max series by ie-pham · Pull Request #5016 · grafana/tempo · GitHub
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[bugfix] fix avg_over_time & compare queries panic with max series #5016

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[bugfix] fix avg_over_time & compare queries panic with max series #5016

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@ie-pham ie-pham commented Apr 16, 2025 •
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What this PR does:

  1. Max series PR introduced a bug for avg_over_time metrics queries. The metrics calculation relies on a pair of series per actual value and when the max series limit truncated the series, in some occurrences, one of the pair is no longer in the resulting time series - leading to a panic during aggregations.
  2. Truncating the series caused issues for the frontend because it expects at least one _total series per key (attribute key). This PR add different truncating logic for compare queries.

Which issue(s) this PR fixes:
Fixes #

Checklist

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

@ie-pham ie-pham marked this pull request as ready for review April 16, 2025 23:34
mdisibio
mdisibio reviewed Apr 17, 2025
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modules/frontend/combiner/metrics_query_range.go Outdated
@@ -58,7 +58,9 @@ func NewQueryRange(req *tempopb.QueryRangeRequest, maxSeriesLimit int) (Combiner
if combiner.MaxSeriesReached() {
// Truncating the final response because even if we bail as soon as len(resp.Series) >= maxSeries
// it's possible that the last response pushed us over the max series limit.
resp.Series = resp.Series[:maxSeries]
if len(resp.Series) > maxSeries {
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Does this also need to check && maxSeries > 0 to handle the case of unlimited? Not sure if there is a case where we could get combiner.MaxSeriesReached() and maxSeries==0.

@ie-pham ie-pham added the type/bug Something isn't working label Apr 17, 2025
@ie-pham ie-pham requested a review from mdisibio April 17, 2025 21:42
@ie-pham ie-pham changed the title [bugfix] fix avg_over_time panic with max series [bugfix] fix avg_over_time & compare queries panic with max series Apr 21, 2025
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This PR has been automatically marked as stale because it has not had any activity in the past 60 days.
The next time this stale check runs, the stale label will be removed if there is new activity. This pull request will be closed in 15 days if there is no new activity.
Please apply keepalive label to exempt this Pull Request.

@github-actions github-actions bot added the stale Used for stale issues / PRs label Jun 28, 2025
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