| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| go.opentelemetry.io/otel/attribute | Package attribute provides key and value attributes. |
| go.opentelemetry.io/otel/internal/metric/registry | Package registry provides a non-standalone implementation of MeterProvider that adds uniqueness checking for instrument descriptors on top of other MeterProvider it wraps. |
| go.opentelemetry.io/otel/metric | Package metric provides the OpenTelemetry API used to measure metrics about source code operation. |
| go.opentelemetry.io/otel/metric/number | |
| go.opentelemetry.io/otel/metric/sdkapi | |
| 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. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |