Fixes metric prefix

[fedefernandez]

What this does?

Fixes an issue with the metrics name. It also releases a new patch version

Checklist

• Reviewed the diff to look for typos, println and format errors.
• Updated the docs accordingly.

[codecov]

Codecov Report

Merging #609 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #609   +/-   ##
=======================================
  Coverage   82.46%   82.46%           
=======================================
  Files          62       62           
  Lines         964      964           
  Branches       12       12           
=======================================
  Hits          795      795           
  Misses        169      169

Impacted Files	Coverage Δ
...kindness/mu/rpc/prometheus/PrometheusMetrics.scala	92.3% <ø> (ø)	⬆️

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