As a PostgreSQL administrator, you may be responsible for creating user accounts and groups. You may also be responsible for granting and revoking privileges. The alert will notify you when a user role is about to expire in N days.
To create the alert, click on Alerts > Manage Alerts tab and create a Custom Alert of type Custom SQL Alert - Multiple Numeric Return. Configure the alert with values similar to these:
Alert Name: User role expires in N days
Execution Interval: 1 days
Notification Text: Empty
select rolname, EXTRACT(DAYS FROM now()-rolvaliduntil) from pg_roles WHERE rolvaliduntil is not null
Execute Against: Monitored Instance
High Threshold: Min 2, Max 15