What is too\_many\_pings error in grpc?

1. Are these error only from server to client side or there are use cases where client can also send the same to server(I know its weird! but in case any use case exist!!)
2. Does the server disconnects the channel after this error or still ready to receive request ?

How to avoid it? Is it a good idea to avoid it?

Thanks in advance,
Nilotpal