| 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. |
| github.com/opentracing/opentracing-go | |
| github.com/opentracing/opentracing-go/ext | |
| github.com/opentracing/opentracing-go/log | |
| go.opentelemetry.io/otel/api/core | |
| go.opentelemetry.io/otel/api/key | |
| go.opentelemetry.io/otel/api/trace | |
| go.opentelemetry.io/otel/bridge/opentracing/migration | |
| google.golang.org/grpc/codes | Package codes defines the canonical error codes used by gRPC. |
| net/http | Package http provides HTTP client and server implementations. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |