Matt Bostock 329a00e44f Relabel: Document whole label set is dropped
From the documentation and current tests, it wasn't immediately clear to
me whether the `target` being dropped as the result of a 'drop' action
was a label key-value pair or the entire labelset.

Add a test that documents this behaviour.

Documentation: https://prometheus.io/docs/operating/configuration/
2016-06-07 17:13:30 +01:00
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