Add log when initializing Sentinel Dubbo filters

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboConsumerFilter.java

@@ -20,6 +20,7 @@ import com.alibaba.csp.sentinel.EntryType;
 import com.alibaba.csp.sentinel.SphU;
 import com.alibaba.csp.sentinel.Tracer;
 import com.alibaba.csp.sentinel.context.ContextUtil;
+import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.slots.block.BlockException;
 import com.alibaba.csp.sentinel.slots.block.SentinelRpcException;
 import com.alibaba.dubbo.common.extension.Activate;
@@ -42,6 +43,10 @@ import com.alibaba.dubbo.rpc.RpcException;
 @Activate(group = "consumer")
 public class SentinelDubboConsumerFilter extends AbstractDubboFilter implements Filter {
 
+    public SentinelDubboConsumerFilter() {
+        RecordLog.info("Sentinel Dubbo consumer filter initialized");
+    }
+
     @Override
     public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
         Entry interfaceEntry = null;

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboProviderFilter.java

@@ -20,6 +20,7 @@ import com.alibaba.csp.sentinel.EntryType;
 import com.alibaba.csp.sentinel.SphU;
 import com.alibaba.csp.sentinel.Tracer;
 import com.alibaba.csp.sentinel.context.ContextUtil;
+import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.slots.block.BlockException;
 import com.alibaba.csp.sentinel.slots.block.SentinelRpcException;
 import com.alibaba.dubbo.common.extension.Activate;
@@ -42,6 +43,10 @@ import com.alibaba.dubbo.rpc.RpcException;
 @Activate(group = "provider")
 public class SentinelDubboProviderFilter extends AbstractDubboFilter implements Filter {
 
+    public SentinelDubboProviderFilter() {
+        RecordLog.info("Sentinel Dubbo provider filter initialized");
+    }
+
     @Override
     public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
         // Get origin caller.