Improve Prometheus recording rule format

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[slok]

Codecov Report

❗ No coverage uploaded for pull request base (main@fb8eef8). Click here to learn what that means.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage        ?   89.53%           
=======================================
  Files           ?        5           
  Lines           ?      172           
  Branches        ?        0           
=======================================
  Hits            ?      154           
  Misses          ?        9           
  Partials        ?        9           

Impacted Files	Coverage Δ
internal/prometheus/recording_rules.go	100.00% <100.00%> (ø)

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