Logstash syslog input filter default grok patterns

Elastic Stack Logstash
1

What are the default grok patterns for the syslog input filter?

The data is from old snare, failing messages are formatted something like this:

<135> 07/18/2022:18:14:52 GMT HOSTNAME syslog_message.

Thanks

2

The default value depends on ecs_compatibility. It is set here. The SYSLOGLINE pattern is defined either here or here. I very much doubt it will match that date format with a timezone. You will need to write your own pattern.