frontend-grpc: limit the number of request processing threads (!196) · Merge requests · cta / CTA

if a large number of requests are submitted to CTA, then frontend will spawn too many threads that eventually 'kill' the service.

This change introduces a thread number limit, which defaults to 8xCPUs, if not explicitly defined during the start.

It would be nice to get this change backport into 5.7 branch

frontend-grpc: limit the number of request processing threads