spring-cloud-tencent-examples com.tencent.cloud ${revision} ../pom.xml 4.0.0 polaris-circuitbreaker-example Polaris Circuit Breaker Example pom polaris-circuitbreaker-example-a polaris-circuitbreaker-example-b polaris-circuitbreaker-example-b2 com.tencent.cloud spring-cloud-starter-tencent-polaris-discovery