Surprised I don't see something about "context deadline exceeded" in there. This error has been plaguing me from Kubernetes 1.5 to 1.18, and nobody has a solid answer for it other than maybe it's Docker related. Solution? Restart your node(s).
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).
