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doc: clarified behaviour of source_labels in relabel_config

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Signed-off-by: Sebastian Schubert <basti@schubert.digital>
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Sebastian Schubert 2025-02-26 17:57:44 +01:00
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docs/configuration/configuration.md
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@ -2551,7 +2551,8 @@ input to a subsequent relabeling step), use the `__tmp` label name prefix. This
prefix is guaranteed to never be used by Prometheus itself.
```yaml
# The source labels select values from existing labels. Their content is concatenated
# The source_labels tells the rule what labels to fetch from the series. Any
# labels which do not exist get a blank value (""). Their content is concatenated
# using the configured separator and matched against the configured regular expression
# for the replace, keep, and drop actions.
[ source_labels: '[' <labelname> [, ...] ']' ]