#12 expose prometheus metrics endpoint

...r/github.com/matttproud/golang_protobuf_extensions/NOTICE

...m/matttproud/golang_protobuf_extensions/pbutil/.gitignore

...com/matttproud/golang_protobuf_extensions/pbutil/Makefile

...om/matttproud/golang_protobuf_extensions/pbutil/decode.go

...b.com/matttproud/golang_protobuf_extensions/pbutil/doc.go

...om/matttproud/golang_protobuf_extensions/pbutil/encode.go

vendor/github.com/prometheus/client_golang/LICENSE

vendor/github.com/prometheus/client_golang/NOTICE

...github.com/prometheus/client_golang/prometheus/.gitignore

.../github.com/prometheus/client_golang/prometheus/README.md

...ometheus/client_golang/prometheus/build_info_collector.go

...thub.com/prometheus/client_golang/prometheus/collector.go

...github.com/prometheus/client_golang/prometheus/counter.go

...or/github.com/prometheus/client_golang/prometheus/desc.go

vendor/github.com/prometheus/client_golang/prometheus/doc.go

...m/prometheus/client_golang/prometheus/expvar_collector.go

vendor/github.com/prometheus/client_golang/prometheus/fnv.go

...r/github.com/prometheus/client_golang/prometheus/gauge.go

...b.com/prometheus/client_golang/prometheus/go_collector.go

...prometheus/client_golang/prometheus/go_collector_go116.go