[DBMON-3300] collect function & count metrics for auto discovered databases

[lu-zhengda]

What does this PR do?

Postgres integration will start collecting function & count metrics for auto discovered databases.

Motivation

Function & count metrics are database specific, but they were not being properly collected for auto discovered databases.

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b70fce7) 90.53% compared to head (518d5ae) 90.63%.
Report is 107 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
confluent_platform	?
hive	?
hivemq	?
ignite	?
jboss_wildfly	?
kafka	?
postgres	92.43% <96.96%> (+0.05%)	⬆️
presto	?
solr	?
tomcat	?

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[github-actions]

Test Results

   16 files     16 suites   20m 28s ⏱️
  266 tests   264 ✅   2 💤 0 ❌
2 136 runs  2 032 ✅ 104 💤 0 ❌

Results for commit 518d5ae.