Imports of package registry

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go.opentelemetry.io/otel/api/metric
go.opentelemetry.io/otel/label
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.