more disk space advice

Author: SethTisue

doc/maintenance.md

@@ -16,6 +16,10 @@ processes are running, that kind of thing.
 
 ## Monitoring disk space
 
+A member of the Scala team should check the free disk space numbers
+on all nodes about every 3 to 4 days.  We should always have at
+least 10G free on all nodes.
+
 A quick way to keep an eye on disk space is by visiting
 https://scala-ci.typesafe.com/computer/.  You'll need to launch
 any offline nodes in order to get a disk space number.