Properly handle empty job and label values #752
Merged
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An empty job name was always an error, but it was previously only
detected when pushing to the PGW and receiving an error. With this
commit, the error is detected before pushing.
An empty label value should have been OK but was encoded in a way that
couldn't be pushed to the
PGW. Cf. prometheus/pushgateway#344 . This
commit changes the creation of the path in the URL so that it works
with empty label values.
@matevz
Fixes #750 .