Imports go.opentelemetry.io/contrib/instrumentation/host go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp go.opentelemetry.io/otel/sdk/metric go.opentelemetry.io/otel/sdk/resource go.opentelemetry.io/otel/semconv/v1.17.0 Standard library imports context encoding/base64 errors flag fmt log net/url os os/signal time