Is SWF impacted by the us-east-1 2021-12-07 outage?

I know there's a major outage going on in us-east-1 right now, per https://status.aws.amazon.com/. The notice at the top of the page says "Services impacted include: EC2, Connect, DynamoDB, Glue, Athena, Timestream, and Chime and other AWS Services in US-EAST-1."

Per that page's status table (and this RSS feed: https://status.aws.amazon.com/rss/swf-us-east-1.rss ), SWF is currently working.

However, we're seeing tons of 500s in our app logs, and none of our processes that use SWF seem to be making progress.

Is SWF one of those "other impacted services"?

I don't know of any successful requests going through, so I think it is, but an official confirmation would be nice.

An edited example error from our PHP log follows:

Error: start_workflow_execution: exception 'AwsSwfExceptionSwfException' with message 'Error executing "StartWorkflowExecution" on "https://swf.us-east-1.amazonaws.com";
AWS HTTP error: Server error: `POST https://swf.us-east-1.amazonaws.com` resulted in a `500 Internal Server Error` response:
{"__type":"com.amazon.coral.service#InternalFailure","message":"All attempts to invoke operation: StartWorkflowExecution (truncated...)