PMM-13706 fix grafana internal monitoring.

[BupycHuk]

PMM-13706

Link to the Feature Build: SUBMODULES-3850

If this PR adds or removes or alters one or more API endpoints, please review and add or update the relevant API documents as well:

• API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.66%. Comparing base (2caec1e) to head (78e7895).
Report is 8 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #3660      +/-   ##
==========================================
+ Coverage   43.62%   43.66%   +0.03%     
==========================================
  Files         366      366              
  Lines       44328    44328              
==========================================
+ Hits        19338    19354      +16     
+ Misses      23310    23292      -18     
- Partials     1680     1682       +2     

Flag	Coverage Δ
admin	11.51% <ø> (+0.04%)	⬆️
agent	51.98% <ø> (+0.12%)	⬆️
managed	45.39% <100.00%> (ø)
vmproxy	73.45% <ø> (ø)

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