service/email.md

@@ -466,6 +466,15 @@ reproduce the metric by running the command:
 
     /usr/local/bin/directory-size-inodes /var/mail
 
+Once you've fixed the error, the alert should recover after the
+metrics refresh, which happens only daily. To expedite the process,
+run the timer by hand:
+
+    systemctl start directory-size-inodes
+
+Note that the normal value is `1`, not `0`, as the script counts
+`/var/mail` itself as a file.
+
 ## Disaster recovery
 
 N/A. The server should be rebuildable from scratch using the Puppet