Statistics Configuration Examples

This section provides several examples of configuring statistics channels to solve everyday tasks.

Assuming we've a simple variable that represents current temperature in degrees (Celsius). The variable has only one record with a single field called temp. However, we want our statistics to be based on Fahrenheit-scale metering.

Here is how the channel properties should be set up for this case:

• The channel Expression should be {temp} * 9 / 5 + 32. This will ensure temperature conversion.
• Since the channel is based on a simple (non-tabular) variable, Use Key Field setting should be disabled.

This example illustrates how to track disk usage for the case when multiple disks stats is located in a single table.

Assuming we have a variable with the following value:

Label field is a key field according to the above table's format.

Here is how the channel properties should be set up for this case:

• Our channel Expression will be {Used}

• Since we need to create a single RRD dataset for every tracked disk, the Use Key Field flag should be enabled
• If we leave Key Field Name property at default (NULL), the system will use value of Label field (i.e. disk labels) as dataset names. This will happen since Label is a key field. However, this is not convenient, so we set Key Field to Disk. This forces disk names to be used for naming RRD datasets.

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