| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| flag | Package flag implements command-line flag parsing. |
| google.golang.org/grpc | Package grpc implements an RPC system called gRPC. |
| google.golang.org/grpc/balancer/grpclb | Package grpclb defines a grpclb balancer. |
| google.golang.org/grpc/balancer/rls | Package rls implements the RLS LB policy. |
| google.golang.org/grpc/credentials/google | Package google defines credentials for google cloud services. |
| google.golang.org/grpc/credentials/insecure | Package insecure provides an implementation of the credentials.TransportCredentials interface which disables transport security. |
| google.golang.org/grpc/grpclog | Package grpclog defines logging for grpc. |
| google.golang.org/grpc/interop | Package interop contains functions used by interop client/server. |
| google.golang.org/grpc/interop/grpc_testing | |
| google.golang.org/grpc/xds/googledirectpath | Package googledirectpath implements a resolver that configures xds to make cloud to prod directpath connection. |
| log | Package log implements a simple logging package. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |