Imports of package metricdata

PathSynopsis
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
go.opentelemetry.io/otel/attributePackage attribute provides key and value attributes.
go.opentelemetry.io/otel/sdk/instrumentationPackage instrumentation provides types to represent the code libraries that provide OpenTelemetry instrumentation.
go.opentelemetry.io/otel/sdk/resourcePackage resource provides detecting and representing resources.
strconvPackage strconv implements conversions to and from string representations of basic data types.
timePackage time provides functionality for measuring and displaying time.