Service instance global actions per second limit exceeded.
Possible Causes
Your application is generating too many actions per second (APS) for Chat service instance either to a specific Chat API endpoint or across different Chat API endpoints
Note that the APS limit is enforced for commands such as sending a Message or creating a Channel - not Read actions
Possible Solutions
Make sure your application (client or backend) uses a good exponential back-off algorithm like the one advocated by Amazon to retry on HTTP 429 (rate limiting) responses
Reduce the rate of requests and introduce basic rate control, e.g. for user or channel provisioning use-cases