Using TALES Expressions in Alias Formulas

For cases in which contextual information is needed, the alias formula can contain a TALES expression that has access to the device as context (labeled as "here"). The result of the TALES evaluation should be an RRD formula.

For example, if the desired value is the data point value divided by total memory, the formula is:

${here/hw/totalMemory},/

For more information about TALES, see TALES Expressions.