public Builder rpcExt(final String rpcExt) {
            this.rpcExt = rpcExt;
            return this;
        }
build rpcExt.

@param rpcExt rpcExt
@return this
shenyu-e2e/shenyu-e2e-common/src/main/java/org/apache/shenyu/e2e/model/data/MetaData.java