A string (up to 8 characters) used in the report instead of response time if a HTTP error was detected (403, 404, 500 etc.). For instance, "HTTPERR".
A string (up to 8 characters) used in the report instead of response time if a network (socket) error was detected.
A string (up to 8 characters) used in the report instead of response time if the $fail error condition was detected.
A string (up to 8 characters) used in the report instead of response time if the response time exceeded the Timeout value.