Add an example of a custom classifier

I'd like to see an example of custom classifier that is proven to work with custom data. The reason for the request is my headache when trying to write my own and my efforts simply do not work. My code (and patterns) work perfectly in online Grok debuggers, but they do not work in AWS. I do not get any errors in the logs either. My data simply does not get classified and table schemas are not created.

So, the classifier example should include a custom file to classify, maybe a log file of some sort. The file itself should include various types of information so that the example would demonstrate various pattern matches. Then the example should present the classifier rule, maybe even include a custom keyword to demonstrate the usage of that one too. Also, a deliberate mistake should also be demoed (both in input data and patterns) and how to debug this situation in AWS.

Thanks in advance!

The issue names no files or tests, so start by reviewing existing AWS Glue classifier samples. Add a working custom-data example with classifier rules, a custom keyword, and deliberate input and pattern mistakes; done means it classifies the data, creates table schemas, and explains how to debug failures in AWS.

Written by the indexing model from the issue text.