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Different filters are applied to each package. The “thresholding­group” parameter is required here and the value points to a matching definition in thresholds.xml, where the MIBs to threshold and the threshold values, are specified.
Figure 73: OpenNMS Modified thresholds.xml for CC­snmp group and raddle­snmp group
The attributes of a threshold are:
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type: A "high" threshold triggers when the value of the data source exceeds the "value", and is re­armed when it drops below the "re­arm" value. Conversely, a "low" threshold triggers when the value of the data source drops below the "value", and is re­armed when it exceeds the "re­arm" value. "relativeChange" is for thresholds that trigger when the change in data source value from one collection to the next is greater than "value" percent. expression: A mathematical expression involving datasource names which will be evaluated and compared to the threshold values. This is used in "expression" thresholding (supported from 1.3.3). ds­name: The name of the variable to be monitored. This matches the name in the “alias” parameter of the MIB statement in datacollection­config.xml .
ds­type: Data source type. “node” for node­level data items, and "if" for interface­level items. ds­label: Data source label. The name of the collected "string" type data item to use as a label when reporting this threshold. Note: this is a data item whose value is used as the label, not the label itself. value: The value that must be exceeded (either above or below, depending on whether this is a high or low threshold) in order to trigger. In the case of relativeChange thresholds, this is the percent that things need to change in order to trigger (e.g. 'value="1.5"' means a 50% increase). rearm: The value at which the threshold will reset itself. Not used for relativeChange thresholds.