howto/upgrades.md

@@ -211,6 +211,10 @@ run the check by hand:
 
     needrestart -v
 
+To check the entire fleet, run this command in [Fabric](howto/fabric):
+
+    fab host.all-pending-restarts
+
 Packages are blocked from upgrades when they cause significant
 breakage during an upgrade run, enough to cause an outage and/or
 require significant recovery work. This is done through Puppet, in the