I can confirm that Kerberos support for the Kafka output is not being currently worked on. At this point I'd suggest commenting on https://github.com/elastic/beats/issues/5413, expressing your desire to work on this and perhaps explaining a little bit about how you plan to go about it — which areas of the code you see changing, any dependencies you might need, etc. If that all sounds good to the core team, you can go ahead with signing the CLA and putting up a PR. Alternatively you can go ahead and sign the CLA and put up the PR directly but then you should expect discussion on the PR itself.
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