| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| go.opencensus.io/plugin/ocgrpc | Package ocgrpc contains OpenCensus stats and trace integrations for gRPC. |
| go.opencensus.io/stats | Package stats contains support for OpenCensus stats recording. |
| go.opencensus.io/stats/view | Package view contains support for collecting and exposing aggregates over stats. |
| go.opencensus.io/tag | Package tag contains OpenCensus tags. |
| go.opencensus.io/trace | Package trace contains support for OpenCensus distributed tracing. |
| gocloud.dev/gcerrors | Package gcerrors provides support for getting error codes from errors returned by Go CDK APIs. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| time | Package time provides functionality for measuring and displaying time. |