Aggregation Plugin

Introduction

Aggregation plugin is a cool feature that come with Collectd 5.2.

Exemple of a collectd configuration :

LoadPlugin aggregation
<Plugin "aggregation">
 <Aggregation>
   Plugin "cpu"
   Type "cpu"

   GroupBy "Host"
   GroupBy "TypeInstance"

   CalculateNum false
   CalculateSum true
   CalculateAverage true
   CalculateMinimum false
   CalculateMaximum false
   CalculateStddev false

 </Aggregation>
 <Aggregation>
   Plugin "df"
   Type "df_complex"

   GroupBy "Host"
   GroupBy "TypeInstance"

   CalculateNum false
   CalculateSum true
   CalculateAverage true
   CalculateMinimum false
   CalculateMaximum false
   CalculateStddev false

 </Aggregation>
</Plugin>

Now we have some rrds :

aggregation-cpu-average
aggregation-cpu-sum
aggregation-df-average
aggregation-df-sum

Configure CGraphz

If you only use an "all match regex" (see Admin/Filters) you don't need to do something.

In other way, you need to add some filters to group your aggregation PluginCategory with his matching Plugin; The best way to do this (I think) is :

1. Create a new filter

• Naming (Description) it Plugin_aggr, exemple cpu_aggr
• Plugin : aggregation
• PluginInstance : Plugin.*, exemple cpu.*
• Type : like your plugin, generally \w+
• TypeInstance : like your plugin, generally .*
• Displayed order it at the same level as your plugin : default value for cpu is 3

1. Go to permissions/groups

• Add this filter to all group you want

And voilà !