def set_limit(self, identifier, expires_at, blocking=False):
self._limits[identifier] = (expires_at, blocking)<EOL>
Set a new trigger or response limit
:param identifier: The Trigger or Response object
:type  identifier: parser.trigger.Trigger or parser.trigger.response.Response

:param expires_at: The limit expiration as a Unix timestamp
:type  expires_at: float

:param blocking: When True and a limit is triggered, no other Trigger or Response's will be attempted
:type  blocking: bool