At least in the DB Uptime widget we are only computing average uptime for MySQL and MongoDB nodes, we ought to add PostgreSQL as well.

 avg(mysql_global_status_uptime{instance=~"$host"} or mongodb_mongod_instance_uptime_seconds {instance=~"$host"})

Tasks

1. Update DB Uptime to include PostgreSQL nodes
2. Change Parameter "Stat" from Avg -> Current
3. Review other elements of Environmental Overview and update as needed to support PG