Changing grok pattern gradually

Elastic Stack Logstash
1

Hi!

I'd like to expand the logging to have more granular data available. However, the log format can't be updated on every instance, also in some cases, a backup restore will reset the changes. My issue is if I extend the grok pattern, it'll cause parse error for the fields not present in the current log format. Also, I would like not to rename the log itself.
Is there a way to set a conditional which won't result in a parse error?

Thank you!
YvorL

2

The grok filter's tag_on_failure option can be set to an empty array to avoid tagging events with _grokparsefailure.

3

Thank you!
I'll check it, but if I'm not mistaken, it'll only prevent showing that the parsing was unsuccessful and I still won't get the data I need from the "old" log format.

4

I don't understand. If you give an example it might be easier to get what you're trying to do.