Performance Monitoring Tweaks for Zenoss

From SysAdminWiki

Contents 1 File System Growth Graph 2 Show Correct Windows Event Count 3 Show the percentage used when one of your file systems crosses it's threshold 4 Another Variation

File System Growth Graph

• 1. Go the device class: /Devices/Server
• 2. Go to templates and edit the Filesystem template

• 3. Add a new graph called Utilization bytes.
• 4. Add the Usedblocks datapoint and choose the datapoint.
• 5. Add the following to RPN:

${here/blockSize},*

Show Correct Windows Event Count

Windows events often repeat themselves and Windows tells you how many times. Unfortunately Zenoss sees each occurrence as a separate event. Here is how to rename the event to make Zenoss aware that this is just a duplicate of another event:

import re
evt.summary = re.sub('It has done this [0-9]+ time\(s\).', '',
evt.message) 

Show the percentage used when one of your file systems crosses it's threshold

• 1. Click Classes -> Events -> Perf -> Filesystem
• 2. Click on the breadcrumb and choose More > Transform
• 3. Add the following:

fs_id = device.prepId(evt.component)
for f in device.os.filesystems():
    if f.id != fs_id: continue
    p = (float(f.usedBytes()) / f.totalBytes()) * 100
    evt.summary = "Filesystem threshold exceeded: current value %3.1f%%" % (p)
    break

• 4. Click Save.

Note:
You can browse directly to the transform rule from this: http://YOUR-ZENOSS:8080/zport/dmd/Events/Perf/Filesystem/editEventClassTransform

Once there is a threshold exceeded the event looks like this.

Filesystem threshold exceeded: current value 92%

Another Variation

Found this but never got to test it yet:

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