It is just a timeout. Golang uses contexts which can have timeout set. Then you can do a request (HTTP/GRPC) under that context and if it times out before getti

It is just a timeout. Golang uses contexts which can have timeout set. Then you can do a request (HTTP/GRPC) under that context and if it times out before getting a response, this error is returned. To find the real reason you are supposed to know the architecture and monitor metrics. It can be network problem or kernel problem (resource exhaustion).