Fix process metrics dashboard

[mariomac]

Solves #1670

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.70%. Comparing base (3c4e678) to head (449b507).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1672      +/-   ##
==========================================
+ Coverage   69.67%   69.70%   +0.02%     
==========================================
  Files         209      209              
  Lines       20965    20965              
==========================================
+ Hits        14608    14614       +6     
+ Misses       5653     5648       -5     
+ Partials      704      703       -1     

Flag	Coverage Δ
integration-test	53.95% <ø> (+0.05%)	⬆️
k8s-integration-test	55.34% <ø> (+0.31%)	⬆️
oats-test	35.25% <ø> (ø)
unittests	46.16% <ø> (ø)

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[marevers]

LGTM and makes sense, for rate, $__rate_interval should always be used.

[grcevski]

LGTM!