doc: add label copy doc#4158
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cgrinds
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Feb 20, 2026
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Pull request overview
This PR adds documentation for using the join plugin feature to copy labels with a different name. This extends the existing join documentation by explaining how to use an empty separator with a single source label to effectively copy a label value to a new label name while preserving the original.
Changes:
- Added documentation explaining how to use
jointo copy a label with a different name using an empty separator
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