| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| go.etcd.io/etcd/client/v3 | |
| go.etcd.io/etcd/server/v3/embed | |
| go.uber.org/zap/zapcore | Package zapcore defines and implements the low-level interfaces upon which zap is built. |
| go.uber.org/zap/zaptest | Package zaptest provides a variety of helpers for testing log output. |
| google.golang.org/grpc | Package grpc implements an RPC system called gRPC. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| net/url | Package url parses URLs and implements query escaping. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| testing | Package testing provides support for automated testing of Go packages. |
| time | Package time provides functionality for measuring and displaying time. |