| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/grpc/backoff | Package backoff provides configuration options for backoff. |
| google.golang.org/grpc/connectivity | Package connectivity defines connectivity semantics. |
| google.golang.org/grpc/credentials/tls/certprovider | Package certprovider defines APIs for Certificate Providers in gRPC. |
| google.golang.org/grpc/grpclog | Package grpclog defines logging for grpc. |
| google.golang.org/grpc/internal/backoff | Package backoff implement the backoff strategy for gRPC. |
| google.golang.org/grpc/internal/credentials/xds | Package xds contains non-user facing functionality of the xds credentials. |
| 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/internal/grpcsync | Package grpcsync implements additional synchronization primitives built upon the sync package. |
| google.golang.org/grpc/internal/transport | Package transport defines and implements message oriented communication channel to complete various transactions (e.g., an RPC). |
| google.golang.org/grpc/internal/xds/bootstrap | Package bootstrap provides the functionality to initialize certain aspects of an xDS client by reading a bootstrap file. |
| google.golang.org/grpc/xds/internal/xdsclient/xdsresource | Package xdsresource implements the xDS data model layer. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| sync/atomic | Package atomic provides low-level atomic memory primitives useful for implementing synchronization algorithms. |
| time | Package time provides functionality for measuring and displaying time. |