code: func ChangeCustomContactVar(
  	contact_name string,
  	varname string,
  	varvalue string,
  ) *livestatus.Command {
  	return livestatus.NewCommand(
  		"CHANGE_CUSTOM_CONTACT_VAR",
  		stringifyArg("contact_name", "string", contact_name),
  		stringifyArg("varname", "string", varname),
  		stringifyArg("varvalue", "string", varvalue),
  	)
  }
docs: // ChangeCustomContactVar creates a new "CHANGE_CUSTOM_CONTACT_VAR" Nagios command.
  //
  // Changes the value of a custom contact variable.