in monitoring -> triggers we can filter by acknowledgement status.
in some environments it is useful to filter by user who acknowledged the problems - for example, to see what a specific user is supposed to be working on.

this should be a separate option from "Acknowledge status", as it is desired to see both unacknowledged triggers and triggers acknowledged by a specific user.

there should be a way to choose "current user" and also another user. choosing another user should be a search-as-you-type inputfield.

open questions :
should it be possible to choose multiple users, or user group ?
when current user is not a superadmin, which users should it be able to select ? note that all users can see all acknowledgements, so it would be weird if they would be unable to filter by those users