Imports of package metric

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
errorsPackage errors implements functions to manipulate errors.
go.opentelemetry.io/otel/label
go.opentelemetry.io/otel/metric/number
go.opentelemetry.io/otel/unit
strconvPackage strconv implements conversions to and from string representations of basic data types.