Remove config reload failure metrics #9660
Merged
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What does this PR do?
This PR removes the configuration reload failure metrics.
Motivation
As of today, there is no mechanism or way to identify a configuration reload failure, and this is why the metric has never been implemented in Traefik v2.
Targeting v3, we can move forward and drop the metric until it can really be implemented.
Fixes #7471
More
Additional Notes
There are no changes in the documentation because those metrics were not documented.