Imports github.com/golang/protobuf/proto github.com/golang/protobuf/ptypes github.com/cncf/udpa/go/udpa/annotations github.com/envoyproxy/protoc-gen-validate/validate google.golang.org/protobuf/reflect/protoreflect google.golang.org/protobuf/runtime/protoimpl Standard library imports errors fmt strings bytes net net/mail net/url reflect regexp sync time unicode/utf8