jenkinsci/jenkins — pull request #1039 by ChrisA89 (2013-12-03 10:40:39+00:00)
Title: [JENKINS-7776] Show decimals when disk space monitored as less than 1 GB.

The logic relied on the monitor being triggered to show more decimals.
The monitor threshold can be set to something other than 1GB.
Therefore check the available space instead of the triggered status.