Run certain queries on certain databases

[dan-aksenov]

Is your feature request related to a problem? Please describe.
We want to collect business metrics from databases.
It requires running certain queries on specific databases only

Describe the solution you'd like
I think solution should look like:

collectors:
  bsuness_metric1:
    filters:
      database:
        include: "business_db1"
    subsystems:
      business_query11:
        query: "select foo from bar"
        ...
   bsuness_metric2:
    filters:
      database:
        include: "business_db2"
    subsystems:
      business_query12:
        query: "select baz from ban"
        ...

Describe alternatives you've considered
We tried postgres_exporer, but it doesn't have such feature ether.

Additional context
None