they were always caught locally by celery's base handler, however,
we weren't logging them ourselves, which meant it wouldn't be put into
the json logs that are sent to cloudwatch.
We don't use boto2 on the api anymore, not since celery 4.0.2
Note - if you run locally with boto2 still installed you'll see errors
that complain about things like:
boto.exception.SQSError: SQSError: 403 Forbidden
<?xml version="1.0"?><ErrorResponse xmlns="http://queue.amazonaws.com/doc/2012-11-05/"><Error><Type>Sender</Type><Code>SignatureDoesNotMatch</Code><Message>Credential should be scoped to a valid region, not 'queue'. </Message><Detail/></Error><RequestId>52207ca4-9131-58cb-89ae-2d45f06623a3</RequestId></ErrorResponse>
If so, make sure boto2 is completely uninstalled.
