| 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. |
| go.opentelemetry.io/otel/api/core | |
| go.opentelemetry.io/otel/api/key | |
| go.opentelemetry.io/otel/api/trace | |
| go.opentelemetry.io/otel/internal/matchers | |
| google.golang.org/grpc/codes | Package codes defines the canonical error codes used by gRPC. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| testing | Package testing provides support for automated testing of Go packages. |
| time | Package time provides functionality for measuring and displaying time. |