Is it possible to configure a "banner" upon login so I can put an announcement?
AIOPs 23.x, 24.x
On premise doesn't have any hooks to display custom information upon login.
However, there is currently an Enhancement for this UI improvement DE602572 for an update contact Broadcom Support.
Workaround:
If you have configured tenants as either BasicAuth or SamlAuth, you can perform a database query to return a list of users for a notification mailing. The same approach can be performed for LdapAuth, but LDAP integration performs a user sync from their LDAP server, so the list will also contain users that have not logged in requiring some care to determine the size of users in a mailing.
Below an example of the postgres query you can use to retrieve the list of users
psql> select userid from arudsuser;