路由规则

java -jar xxx-provider.jar -Ddubbo.provider.tag={the tag you want, may come from OS ENV}

请问我用的2.7.8版本测试，没有生效

Start by reading the routing rules documentation and the section describing the Java launch command, including the 2.7.8 example. Reproduce the reported command with the provider tag and compare the observed behavior with the documented expectation; done means the cause is documented clearly or a confirmed documentation defect is identified.

Written by the indexing model from the issue text.