Reads the given parameter and assigns value to a field in the event.

ParameterTypeRequiredDefaultDescription
asstringrequired  The name of the output field.
parameter[a]stringrequired  The name of the parameter to read.

[a] The argument name parameter can be omitted.

Omitted Argument Names

The argument name for parameter can be omitted; the following forms of this function are equivalent:

logscale
beta:param("value")

and:

logscale
beta:param(parameter="value")