[prometheus-postgres-exporter] Implement ability to define an existin… #5011
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…g secret for the configuration file
What this PR does / why we need it
This PR allows the user to define an existing secret as the postgres_exporter.yml configuration.
Which issue this PR fixes
(optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)
format, will close that issue when PR gets merged)Special notes for your reviewer
Checklist
[prometheus-couchdb-exporter]
)