Imports of package prometheus

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/golang/glogPackage glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup.
github.com/google/trillian/monitoringPackage monitoring provides monitoring functionality.
github.com/prometheus/client_golang/prometheusPackage prometheus is the core instrumentation package.
github.com/prometheus/client_model/go