DMS Task Fails with RECOVERABLE_ERROR but no other info

Should note that logging is enabled and all log levels are set to LOGGER_SEVERITY_DETAILED_DEBUG and yet no log streams are created. Both endpoints pass connectivity checks. DMS replication instance is almost certainly over provisioned (have run more extensive DMS tasks on other sources with lower tier instance types) and reported instance metrics are very very low.

So logging was failing because when you create DMS resources via Cloudformation the dms-cloudwatch-logs-role doesn't exist and won't be created.

https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Security.APIRole.html

Was then bouncing off of errors along the lines of "No suitable plugin found" - i had not yet run the following scripts to support legacy function names:

https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Source.PostgreSQL.html#CHAP_Source.PostgreSQL.v10

Hope this info helps someone in the future.