Imports of package metrics

PathSynopsis
crypto/sha256Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
hashPackage hash provides interfaces for hash functions.
k8s.io/component-base/metrics
k8s.io/component-base/metrics/legacyregistry
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.