Name of iRule in variable?

I recommend avoiding logging without requirement. If you don't intend to act one way or the other based on the logs, there is no point in logging. If you intend to capture the logs, you can use any unique word to identify the logs. Using capitalized unique word stands out easily among the logs. Example: F5-SYS-LOG. You can use the previous example within the "log local0." statement in the iRule.