| 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/attribute | Package attribute provides key and value attributes. |
| 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/sdk/export/metric | |
| go.opentelemetry.io/otel/sdk/export/metric/aggregation | |
| go.opentelemetry.io/otel/sdk/resource | Package resource provides detecting and representing resources. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |