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How to Track Field Changes in Parser Updates to Prevent Rule Breaks?

  • March 16, 2026
  • 1 reply
  • 49 views

desertfalcon

Hi everyone,

It has been observed that parser changes can sometimes break existing rules, especially when certain fields are modified, renamed, or their structure changes. This can lead to unexpected issues in rule execution.

I wanted to ask how to track which fields have been updated when parser changes are introduced. Are there recommended methods or tools to identify field-level changes between parser versions?

Additionally, what are some effective strategies or best practices to handle these situations and prevent rules from breaking when parser updates occur?

For example:

  • Do you maintain a field change log or use automated comparisons between parser versions?

  • Are there monitoring or validation techniques to quickly detect when rules are impacted by parser updates?

  • What processes do you follow to safely update rules when parser fields change?

Any insights, experiences, or recommended approaches would be greatly appreciated.

Thanks!

1 reply

idanpatelsky
Staff
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Hi! 🌞

In SecOps, when you are moving between two parser versions (opt-in to preview version, rollback, upgrade to a new version), the parser upgrade screen gives you all the contextual data regarding the differences between the two versions. This includes code diff, UDM output diff (you can use a sample log as reference), and the change log which specifies the changes in the new version. You can see an example in the screenshot added below.

Full details are also available in the documentation portal - 

https://docs.cloud.google.com/chronicle/docs/event-processing/manage-parser-updates#manage_parser_updates

On top of that, Google SecOps is working on a new, unique capability called ‘Parser Impact Analysis’ which will enable users to calculate the impact of a new parser version on your detection rules (this will be added to the parser version upgrade experience mentioned above). Using this capability the system will analyze which of your detection rules might be impacted by the new parser version and why (which UDM fields were changed in the new parser version, and in which part of the rule these fields are used).

This new capability is planned to be introduced in the platform later this year.

Hope this helps 🙏