Show the % usage in a filesytem threshold?

This is possible using an event mapping.
Did you ever used an event mapping before?

Okay let's hit it.

navigate to the web interface to: Classes => Events > Perf > Filesystem
Now click on the breadcrumb and choose  More  > Transform

http://YOUR-ZENOSS:8080/zport/dmd/Events/Perf/Filesystem/editEventClassTransform

This brings you to a event transform rule. It is will be called when an event comes in for /Perf/Filesystem.
And this is the eventclass where the filesystem thresholds will be in.

Now add this to the rule box:

import re

fs_id = device.prepId(evt.component)
for f in device.os.filesystems():
   if f.id != fs_id: continue

   # Extract the percent and free from the summary
   m = re.search("threshold of [^:]+: current value ([\d\.]+)", evt.summary)
   if not m: continue
   usedBlocks = float(m.groups()[0])
   p = (usedBlocks / f.totalBlocks) * 100
   freeAmtGB = ((f.totalBlocks - usedBlocks) * f.blockSize) / 1073741824

   # Make a nicer summary
   evt.summary = "Disk space low: %3.1f%% used (%3.2f GB free)" %  (p,freeAmtGB)

   # This is where we change to a per device threshold
   perDeviceThreshold = 95.0
   m = re.search("zz(\d{3})", f.id)
   perDeviceThreshold = m and float(m.groups()[0]) or 95.0
   if p >= perDeviceThreshold: evt.severity = 5
   break
 

6-oct-2008

UPDATE: Chet pointed me to a problem which happens with remote collecters.

He sended me an updated script so please use the once in this page.

It should also be more performant