make sampling still works when the trace ignores plug-in activation (#6146)

CHANGES.md

@@ -24,6 +24,7 @@ Release Notes.
 * Fix ArrayBlockingQueueBuffer's useless `IF_POSSIBLE` mode list
 * Support building gRPC TLS channel but CA file is not required.
 * Add Dolphinscheduler plugin definition.
+* Make sampling still works when the trace ignores plug-in activation.
 * Fix mssql-plugin occur ClassCastException when call the method of return generate key.
 
 #### OAP-Backend

apm-sniffer/optional-plugins/trace-ignore-plugin/src/main/java/org/apache/skywalking/apm/plugin/trace/ignore/TraceIgnoreExtendService.java

@@ -37,6 +37,8 @@ public class TraceIgnoreExtendService extends SamplingService {
 
     @Override
     public void boot() {
+        super.boot();
+
         IgnoreConfigInitializer.initialize();
         if (StringUtil.isNotEmpty(IgnoreConfig.Trace.IGNORE_PATH)) {
             patterns = IgnoreConfig.Trace.IGNORE_PATH.split(PATTERN_SEPARATOR);
@@ -53,6 +55,7 @@ public class TraceIgnoreExtendService extends SamplingService {
 
     @Override
     public void shutdown() {
+        super.shutdown();
     }
 
     @Override
@@ -65,10 +68,11 @@ public class TraceIgnoreExtendService extends SamplingService {
                 }
             }
         }
-        return true;
+        return super.trySampling(operationName);
     }
 
     @Override
     public void forceSampled() {
+        super.forceSampled();
     }
 }

docs/en/setup/service-agent/java-agent/agent-optional-plugins/trace-ignore-plugin.md

 ## Support custom trace ignore
 Here is an optional plugin `apm-trace-ignore-plugin`
 
+**Notice:**
+Sampling still works when the trace ignores plug-in activation.
+
 ## Introduce
 - The purpose of this plugin is to filter endpoint which are expected to be ignored by the tracing system.
 - You can setup multiple URL path patterns, The endpoints match these patterns wouldn't be traced.