feature(pulsar-query): 增加查询 backlog 的方法

service-forest/src/main/java/com/lanyuanxiaoyao/service/forest/service/PulsarService.java

@@ -7,6 +7,7 @@ import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarNamespace;
 import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarTenant;
 import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarTopic;
 import org.eclipse.collections.api.list.ImmutableList;
+import org.springframework.web.bind.annotation.RequestParam;
 
 /**
  * Pulsar
@@ -33,4 +34,7 @@ public interface PulsarService {
 
     @Get("/topics")
     ImmutableList<PulsarTopic> topics(@Query("name") String name, @Query("namespace") String namespace);
+
+    @Get("/backlog")
+    Long backlog(@Query("name") String name, @Query("topic") String topic, @RequestParam("subscription") String subscription);
 }