Oh god, this. At my company, we found a bug recently with rds.describe_events, which we needed to read binlog information after a B/G cutover. The bug, which AWS support “could not see the details of,” was that events would non-deterministically not show up if you were filtering by instance name. Their recommended fix was to pull in all events for the past N minutes, and do client-side filtering.

This was on top of the other bug I had found earlier, which was that despite the docs stating that you can use a B/G as a filter - a logical choice when querying for information directly related to the B/G you just cut over - doing so returns an empty set. Also, you can’t use a cluster (again, despite docs stating otherwise), you have to use the new cluster’s writer instance.