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New Feature
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Resolution: Not A Defect
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Major
There should be an AdministrativeMonitor which checks for a low value of File.getUsableSpace in Jenkins.getRootDir. This could be in core of course, but the Disk Usage plugin seems like a natural home.
Note that there is a hudson.node_monitors.DiskSpaceMonitor, but this only applies to master when it is a Computer, i.e. has some executors; and you cannot take master offline anyway.
There has been such an AdministrativeMonitor in Jenkins core since March 2009: HudsonHomeDiskUsageChecker.java, HudsonHomeDiskUsageMonitor.java.
Is it still a good idea to move that feature to a plugin?