Imports go.opentelemetry.io/otel/metric/global go.opentelemetry.io/otel go.opentelemetry.io/otel/trace go.opentelemetry.io/otel/metric go.opentelemetry.io/otel/attribute github.com/aliyun-sls/opentelemetry-go-provider-sls/provider go.opentelemetry.io/otel/codes Standard library imports context errors fmt math/rand time