Imports of package metrics

PathSynopsis
bytesPackage bytes implements functions for the manipulation of byte slices.
expvarPackage expvar provides a standardized interface to public variables, such as operation counters in servers.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
sortPackage sort provides primitives for sorting slices and user-defined collections.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.