The definition of grok pattern CISCO_REASON

My log entry is like:

2017-05-16T03:48:19.191162+00:00 ip-10-133-8-70 tcp[18916]: LOG Statistics [Sender] ....

In this example, "LOG Statitics" can be extracted by pre-defined pattern: CISCO_REASON

But I cannot find any definition of CISCO_REASON.

Any help is appreciated.

Here it is:

If you don't have v4.1.0 of the logstash-patterns-core plugin you'll have to adjust the URL somewhat.

Thank you!

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