Seeing a lot of errors related to code = DeadlineExceeded

We are seeing a lot of errors

INFO: 2018/04/03 00:47:27 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:27 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:31 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:32 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:32 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:34 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:39 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:40 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:42 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:43 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:43 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:46 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:48 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:55 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:47:55 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:00 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:02 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:02 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:02 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:08 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:08 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:11 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:12 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:15 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:16 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:19 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:21 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"
INFO: 2018/04/03 00:48:22 grpc: Server.processUnaryRPC failed to write status stream error: code = DeadlineExceeded desc = "context deadline exceeded"

Our drone server is running in kubernetes whereas the drone agents run on a docker swarm setup.
Can someone confirm what this error actually is?