Imports
- github.com/prometheus/client_golang/prometheus
- github.com/golang/protobuf/ptypes
- github.com/opentracing/opentracing-go/ext
- google.golang.org/grpc
- github.com/opentracing/opentracing-go/log
- github.com/opentracing/opentracing-go
- golang.org/x/net/context