How can I add custom fields?

Hey everyone, how can I add custom fields (like on screenshot)? I’m a beginner in graylog and I can’t found the answer on google. I found a similar topic here, but it’s closed without solution. I know I need to create an extractor, but even though I’ve read the documentation I don’t understand how I can do it.


For starters did you check the marketplace for an extractor for the type of logs you are bringing in? That is the simplest way if there is a content pack or extractor already made.

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Well, I checked in the marketplace before, but I think the field I would like to create is specific for my application (I want to show an attribute that exists in my code - username). I just want to know the way to create a field because the regexp I’ll create after.

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