init_config:

    instances:
      - host: rds.amazonaws.com
        port: 5432
        username: ddagent
        password: password
        dbname: postgres
        tags:
          - dbinstanceidentifier:$CSR_CN-postgres
        #All index scans & reads
        custom_metrics:
        - # test postgres db
          descriptors:
          - [nspname, nspname]
          metrics:
              nspname: [my.nspname, GAUGE]
          query: SELECT nspname, %s from pg_catalog.pg_namespace;
          relation: false