| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| errors | Package errors implements functions to manipulate errors. |
| google.golang.org/grpc | Package grpc implements an RPC system called gRPC. |
| google.golang.org/grpc/grpclog | Package grpclog defines logging for grpc. |
| google.golang.org/grpc/internal/profiling | Package profiling contains two logical components: buffer.go and profiling.go. |
| google.golang.org/grpc/profiling/proto | |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |