Use this to extend the base set of Logstash grok patterns matching Cisco ASA devices. If you run additional logging, the base firewall patterns don't match -- and they might not match correctly. This is improved, with limitations. It might catch a larger portion of the logs.
- Logstash built-in patterns: https://github.com/logstash-plugins/logstash-patterns-core/tree/main/patterns
- https://grokdebug.herokuapp.com/
Your milage will vary, but feel free to submit a ticket should you want assistence debugging -- or PR to enhance the patterns.