| errors | Package errors implements functions to manipulate errors. |
| 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/aggregator | |
| go.opentelemetry.io/otel/sdk/metric/export | |
| go.opentelemetry.io/otel/sdk/metric/export/aggregation | |
| go.opentelemetry.io/otel/sdk/metric/sdkapi | |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |