Imports
- github.com/golang/protobuf/proto
- github.com/golang/protobuf/ptypes/wrappers
- github.com/golang/protobuf/ptypes/struct
- github.com/golang/protobuf/protoc-gen-go/descriptor
- github.com/golang/protobuf/ptypes/timestamp
- github.com/apache/beam/sdks/go/pkg/beam/model/pipeline_v1
- google.golang.org/grpc