[v10.2.x] Loki: Fix bug duplicating parsed labels across multiple log lines #80368
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Jan 11, 2024
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Backport e1aa8a9 from #80292
What is this feature?
With the addition of the categorization of labels we were mutating the "main" labels object and adding parsed labels per logline to that object. Instead we needed to copy the indexed labels for each log line. This PR adds a fix and test cases.
Special notes for your reviewer:
Start Grafana and the Loki devenv
Do a query like
{place="luna"} |logfmt| line_format "label{{ .label }}={{ unixEpochMillis now }}" | logfmtWithout the fix you should see log lines like this:
And when opening the details you will see duplicated labels, e.g.
labelval1andlabelval3eventhough the logline does only contain one of the labels.With the fix you will only see the label from that one log line.