| 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.opentelemetry.io/otel/attribute | Package attribute provides key and value attributes. |
| go.opentelemetry.io/otel/sdk/metric | Package metric provides an implementation of the OpenTelemetry metrics SDK. |
| go.opentelemetry.io/otel/sdk/metric/metricdata | |
| go.opentelemetry.io/otel/sdk/metric/metricdata/metricdatatest | Package metricdatatest provides testing functionality for use with the metricdata package. |
| testing | Package testing provides support for automated testing of Go packages. |
| time | Package time provides functionality for measuring and displaying time. |