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Predictive Threshold

VERSION 8  Click to view document history
Created on: Sep 14, 2009 1:32 PM by rocketman110 - Last Modified:  Oct 15, 2012 1:56 PM by Ryan Matte

Submitted by:

Eric J. Edgar

Updated by:

Jane Curry


Description:

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 RemoveHoltData.py 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

 


Screenshots:

 

predictive1.png

predictive2.png

 

predictive3.png

 

New screenshots for Zenoss 3 at https://github.com/jcurry/ZenPacks.community.PredictiveThreshold

 


REQUIREMENTS:

     Zenoss Version: 4.2 (py2.7), 3.x, 2.2

     ZenPack Dependencies:

     External Dependencies:

     Installation:

 


Source: http://zenpacks.zenoss.org/trac-zenpacks/browser/zenpacks/ZenPacks.community.PredictiveThreshold

Source for Zenoss 3 on github: https://github.com/jcurry/ZenPacks.community.PredictiveThreshold

Tagged Releases:

     http://zenpacks.zenoss.org/trac-zenpacks/browser/tags/predictivethreshold-1.0

Version 3 zip file on github: https://github.com/jcurry/ZenPacks.community.PredictiveThreshold/blob/master/dist/ZenPacks.community.PredictiveThreshold-2.1-py2.6.egg?raw=true

Change History:

  • 1.0  Original Zenoss 2.x version by Eric Edgar
  • 2.0 Updated for Zenoss 3.x GUI by Jane Curry
  • 2.1 Updated for new github procedures
  • 3.0 Updated by Jane Curry to work with Zenoss 4

 


Trac tickets: http://zenpacks.zenoss.org/trac-zenpacks/report/1

Known issues:

Attachments:
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