server-cluster-plugin org.apache.skywalking 8.9.1 4.0.0 cluster-etcd-plugin cluster-etcd-plugin org.apache.skywalking server-core ${project.version} io.etcd jetcd-core io.grpc grpc-core io.grpc grpc-netty io.netty netty-codec-http2 io.netty netty-handler-proxy io.grpc grpc-protobuf io.grpc grpc-stub io.grpc grpc-grpclb org.yaml snakeyaml