Error codes

We need to document the list of possible error codes returned in the Replication Change Listener.

Transient vs permanent errors

It'd be great to also point out which ones are transient (i.e will cause the replicator to try again) and which ones are not.

That's something developers ask about in the forums. Jim Borden wrote in 15775:

If a continuous replicator stopped it is because it felt it could not get any benefit from trying to continue. Otherwise, for errors like low connectivity, etc, it will keep trying. For an error like a 404 (or in your case 401), however, that’s a permanent error and retrying is not likely to change the outcome so it will stop.