Better document current sysadmin team ticket management (Closes: #16854).

wiki/src/contribute/working_together/roles/sysadmins.mdwn

@@ -115,8 +115,14 @@ Tails system administrators have write access to the puppetmasters, and can log
 the hosts.  
 They read the <tails-sysadmins@boum.org> encrypted mailing list.
 
-We use Redmine tickets for public discussion and tasks management:
-
+We use [[!tails_redmine desc="Redmine"]] tickets for public discussion
+and tasks management:
+
+* To bring a ticket to the attention of system administrators,
+  assign it to the _Sysadmins_ group. You'll find it at the end
+  of the list of possible assignees.
+* [tickets that should be taken care of as part of sysadmin shifts](https://redmine.tails.boum.org/code/projects/tails/issues?query_id=262)
+* [tickets that are on the sysadmin team's roadmap](https://redmine.tails.boum.org/code/projects/tails/issues?query_id=267)
 * [tasks requiring *Sysadmin*
   work](https://redmine.tails.boum.org/code/projects/tails/issues?query_id=113)
 * [tasks belonging to the *Infrastructure*