postgres_exporter not using external PostgreSQL parameters

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When having an external PostgreSQL server and enabling postgres_exporter. The username and password information are not passed on to the postgres_exporter configuration.

To make an external PostgreSQL server work you have to configure DATA_SOURCE_NAME with the PostgreSQL username and password.

It's also not possible to provide a customer queries.yaml file that can be used to collect the PostgreSQL server information.

Related Zendesk ticket: https://gitlab.zendesk.com/agent/tickets/123307