| 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. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/golang/protobuf/proto | Package proto provides functionality for handling protocol buffer messages. |
| google.golang.org/grpc | Package grpc implements an RPC system called gRPC. |
| google.golang.org/grpc/internal/backoff | Package backoff implement the backoff strategy for gRPC. |
| google.golang.org/grpc/internal/buffer | Package buffer provides an implementation of an unbounded buffer. |
| google.golang.org/grpc/internal/grpclog | Package grpclog provides logging functionality for internal gRPC packages, outside of the functionality provided by the external `grpclog` package. |
| google.golang.org/grpc/keepalive | Package keepalive defines configurable parameters for point-to-point healthcheck. |
| google.golang.org/grpc/xds/internal/xdsclient/bootstrap | |
| google.golang.org/grpc/xds/internal/xdsclient/controller/version | |
| google.golang.org/grpc/xds/internal/xdsclient/load | Package load provides functionality to record and maintain load data. |
| google.golang.org/grpc/xds/internal/xdsclient/pubsub | |
| google.golang.org/grpc/xds/internal/xdsclient/xdsresource | Package xdsresource implements the xDS data model layer. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |