NETOBSERV-1005 dashboard: use sum...by [1.3 backport]

[jotak]

• Fix metrics aggregations by using sum...by
• Do not split by FLP pod reporter as it's an implementation detail

Ref PR: #356

[codecov]

Codecov Report

Merging #358 (c18c984) into release-1.3 (ca61fad) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           release-1.3     #358   +/-   ##
============================================
  Coverage        53.37%   53.37%           
============================================
  Files               45       45           
  Lines             5328     5328           
============================================
  Hits              2844     2844           
  Misses            2281     2281           
  Partials           203      203           

Flag	Coverage Δ
unittests	53.37% <ø> (ø)

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[memodi]

/lgtm
/label qe-approved
tested PR #356

[jotak]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jotak

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