Fix bug with new promtail stream lag metric #5675
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applied if they don't exist on the source stream Signed-off-by: Callum Styan <callumstyan@gmail.com>
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This PR fixes a bug from my last PR (#5521) where labels might not be applied if they don't exist on the source stream, which will cause prometheus to panic due to incorrect label cardinality.
Signed-off-by: Callum Styan callumstyan@gmail.com