For me as a server Admin it is a must to get urgent system notifications by mail.
i.E. the Message, which showed to all users in a red bar on the server.

Bitbucket erreicht die Ressourcengrenzen. Pushes, Pulls, das Mergen von Pull Requests und Klons werden eventuell zurückgewiesen oder in die Warteschlange gestellt. Details für Scaling Bitbucket Server ansehen
or
Stash is reaching ressource limits. Pushes, pulls, pull requests merges and clones may be rejected or queued. 

We currently are informed by the user.
Please change bitbucket correspond to that administrators will be informed of messages which the users also get displayed on the Bitbucket Server page.

Thanks
Martin