Predictive Threshold ZenPack
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This ZenPack adds a new Predictive Threshold type for determining when to trigger an event. The threshold uses the Holt-Winters Forecasting from RRDTool.

Retrofitting data exists in the Predictive Threshold. It renames the original .rrd with a .old extension. The script packaged with the ZenPack is a command line tool for converting RRD data back to regular RRD files if you want to convert them back to standard thresholds.

Holt Winters Parameters

  • Alpha = 0.1 # 0-1 , value closer to 1 means more recent observation carries more weight, baseline
  • Beta = 0.0035 # 0-1 , value closer to 1 means more recent observation carries more weight, linear trend
  • Gamma = 0.1 # 0-1 , value closer to 1 means more recent observation carries more weight, seasonal trend
  • Rows = 1440 # rows >=season, 5days, 300second_intervals * 1440 points
  • Season = 288 # 1day, 288points * 300second_intervals
  • Window = 6 # window length .. (eg 6 observations for alerting)
  • Threshold = 3 # number of periods it has to fail in a window before alert sent
  • Delta = 2 # of standard deviations away from predicted value (for alerting)
  • Prediction Color = Color of the predicted value line
  • Confidence Band Color = Color of the confidence bands placed at delta standard deviations from prediction line
  • Tick Color = color of vertical line indicating threshold has been crossed at that value

Requirements & Dependencies

  • Zenoss Versions Supported: 3.0
  • External Dependencies:
  • ZenPack Dependencies:
  • Installation Notes: zenhub and zopectl restart after installing this ZenPack.
  • Configuration:


Beware if you are testing and creating a new template that it takes about 2 days before there is enough data for the Holt-Winters RRA archives to have data so although you see the new lines on the legend of a graph, there are no data lines for this long.

I don't think installing the ZenPack per se, will corrupt anything you currently have; however it may cause problems to existing data. Have a look at - I have seen this both on the old version with 2.5.2 and with the new. I would take my own backup of RRD files before applying a predictive threshold.


Download the appropriate package for your Zenoss version from the list below.


Normal Installation (packaged egg)

Copy the downloaded .egg to your Zenoss server and run the following commands as the zenoss user:

zenpack --install <package.egg>
zenhub restart
zopectl restart

Developer Installation (link mode)

If you wish to further develop and possibly contribute back to this ZenPack you should clone the git repository, then install the ZenPack in developer mode:

zenpack --link --install <package>
zenhub restart
zopectl restart


Tested with Zenoss 3.1

Change History

  • 1.0
    • Eric Edgar's version working on Zenoss 2.2
  • 2.0
    • Changed by Jane Curry to support Zenoss 3.x
  • 2.1
    • Transferred to new github methods


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