PMM-14517 PG-18 support in QAN

[artemgavrilov]

PMM-14517

Link to the Feature Build: SUBMODULES-4069

[codecov]

Codecov Report

❌ Patch coverage is 15.78947% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.72%. Comparing base (586a922) to head (19425e9).

Files with missing lines	Patch %	Lines
...ent/agents/postgres/pgstatmonitor/pgstatmonitor.go	0.00%	21 Missing ⚠️
...nts/postgres/pgstatmonitor/pgstatmonitor_models.go	0.00%	8 Missing and 1 partial ⚠️
...ents/postgres/pgstatstatements/pgstatstatements.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #4739      +/-   ##
==========================================
- Coverage   45.75%   45.72%   -0.03%     
==========================================
  Files         364      364              
  Lines       37755    37790      +35     
==========================================
+ Hits        17275    17281       +6     
- Misses      18823    18851      +28     
- Partials     1657     1658       +1     

Flag	Coverage Δ
admin	17.92% <ø> (ø)
agent	53.54% <0.00%> (-0.17%)	⬇️
managed	46.23% <100.00%> (+0.01%)	⬆️
vmproxy	72.09% <ø> (ø)

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[artemgavrilov]

For PGSS we collecting very limited set of data and I don't know why. I implemented new PG18 data only for PGSM for now. PGSS should be discussed I think.