DPA: PostgreSQL collection requests failing with error: no credentials provided to connect to "postgres" database for auto-discover on server

DPA PostgreSQL collection requests for the DPA Datastore database is failing with the following error:
no credentials provided to connect to "postgres" database for auto-discover on server

Reviewing the PostgreSQL Database Configuration and Status Requests, both are failing with the following error:
no credentials provided to connect to "postgres" database for auto-discover on server

Within the Agent log the following error is seen:
ERR 1592.2584 20170601:051205 agent.mod.pgsqldb - status(): no credentials provided to connect to "postgres" database for autodiscover on server

The DPA Agent on the Datastore server are configured with the postgresdb Config and Status Requests, but may not have credentials assigned.

The error from the log is indicating there are no credentials assigned.

From the DPA UI> Inventory> Object Library>  Applications> Select DPA Datastore server> Data Collection tab> 

Edit the 2 requests for the DPA DataStore node and assign the  Default Postgres Credential  to them.  If this credential does not exist, you can create it so it looks like below (password is blank):



Also make sure the Request options show the following:


The  XML specifying per database parameters/credentials  request option is set to:

<PARAMS><DATABASES discover="false"><DB use="include"><NAME>apollo</NAME></DB></DATABASES></PARAMS>

Click OK > Click Apply

The error should no longer show in the Agent log and data collection should now function normally.