Promtail: Bug: loki push api, clone labels before handling #2464
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…full pipeline and can modify the labels uniquely per each line which will lead to some concurrent map access panics if you don't pass a copy of the labels to each Handle invocation.
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Make a clone of the LabelSet before handling, the handler contains a full pipeline and can modify the labels uniquely per each line which will lead to some concurrent map access panics if you don't pass a copy of the labels to each Handle invocation.
Fixes #2456