I had to do this, because eslint doesn't allow relative imports from keyserver/
I checked that after this change my .json was fetched correctly

This reads keyserver/facts/authoritativeKeyserverID.json

Because ./facts/authoritativeKeyserverID.json may not be present, we need to use require in try/catch instead of import. It's the same approach as in D6373

I was facing some really weird problems when I put this code in config.js, so this file is a workaround. See ENG-6725

This filename does not match conventions in our codebase. Please always try to match conventions

I agree, but if we keep fromJSON, we should fix the capitalization ("f" should be capitalized)

We should update the docs to include some info about creating this file.

Is this really necessary, given that the file will be automatically created? (Let me know if I'm missing something)

It might help with debugging some issues, or when someone would want to manually change the value (but in that case reading the code might be a better idea). Also, if someone wants to reset / clear the user, they would need to delete the file.

This will be done as part of creating docs that is the main point of my goal. I made a note about this in the task: ENG-6676