remove strong dep micrometer in tracing

dubbo-metrics/dubbo-tracing/src/main/java/org/apache/dubbo/tracing/DubboObservationRegistry.java

@@ -20,16 +20,24 @@
 import org.apache.dubbo.common.logger.LoggerFactory;
 import org.apache.dubbo.common.utils.JsonUtils;
 import org.apache.dubbo.config.TracingConfig;
-import org.apache.dubbo.metrics.MetricsGlobalRegistry;
 import org.apache.dubbo.metrics.utils.MetricsSupportUtil;
 import org.apache.dubbo.rpc.model.ApplicationModel;
 import org.apache.dubbo.tracing.handler.DubboClientTracingObservationHandler;
 import org.apache.dubbo.tracing.handler.DubboServerTracingObservationHandler;
+import org.apache.dubbo.tracing.metrics.ObservationMeter;
 import org.apache.dubbo.tracing.tracer.PropagatorProvider;
 import org.apache.dubbo.tracing.tracer.PropagatorProviderFactory;
 import org.apache.dubbo.tracing.tracer.TracerProvider;
 import org.apache.dubbo.tracing.tracer.TracerProviderFactory;
 
+import io.micrometer.observation.ObservationHandler;
+import io.micrometer.observation.ObservationRegistry;
+import io.micrometer.tracing.Tracer;
+import io.micrometer.tracing.handler.DefaultTracingObservationHandler;
+import io.micrometer.tracing.handler.PropagatingReceiverTracingObservationHandler;
+import io.micrometer.tracing.handler.PropagatingSenderTracingObservationHandler;
+import io.micrometer.tracing.propagation.Propagator;
+
 import static org.apache.dubbo.common.constants.LoggerCodeConstants.COMMON_NOT_FOUND_TRACER_DEPENDENCY;
 
 public class DubboObservationRegistry {
@@ -48,8 +56,8 @@ public DubboObservationRegistry(ApplicationModel applicationModel, TracingConfig
 
     public void initObservationRegistry() {
         // If get ObservationRegistry.class from external(eg Spring.), use external.
-        io.micrometer.observation.ObservationRegistry externalObservationRegistry =
-                applicationModel.getBeanFactory().getBean(io.micrometer.observation.ObservationRegistry.class);
+        ObservationRegistry externalObservationRegistry =
+                applicationModel.getBeanFactory().getBean(ObservationRegistry.class);
         if (externalObservationRegistry != null) {
             if (logger.isDebugEnabled()) {
                 logger.debug("ObservationRegistry.class from external is existed.");
@@ -71,36 +79,26 @@ public void initObservationRegistry() {
             return;
         }
         // The real tracer will come from tracer implementation (OTel / Brave)
-        io.micrometer.tracing.Tracer tracer = tracerProvider.getTracer();
+        Tracer tracer = tracerProvider.getTracer();
 
         // The real propagator will come from tracer implementation (OTel / Brave)
         PropagatorProvider propagatorProvider = PropagatorProviderFactory.getPropagatorProvider();
-        io.micrometer.tracing.propagation.Propagator propagator = propagatorProvider != null
-                ? propagatorProvider.getPropagator()
-                : io.micrometer.tracing.propagation.Propagator.NOOP;
+        Propagator propagator = propagatorProvider != null ? propagatorProvider.getPropagator() : Propagator.NOOP;
 
-        io.micrometer.observation.ObservationRegistry registry = io.micrometer.observation.ObservationRegistry.create();
+        ObservationRegistry registry = ObservationRegistry.create();
         registry.observationConfig()
                 // set up a first matching handler that creates spans - it comes from Micrometer Tracing.
                 // set up spans for sending and receiving data over the wire and a default one.
-                .observationHandler(
-                        new io.micrometer.observation.ObservationHandler.FirstMatchingCompositeObservationHandler(
-                                new io.micrometer.tracing.handler.PropagatingSenderTracingObservationHandler<>(
-                                        tracer, propagator),
-                                new io.micrometer.tracing.handler.PropagatingReceiverTracingObservationHandler<>(
-                                        tracer, propagator),
-                                new io.micrometer.tracing.handler.DefaultTracingObservationHandler(tracer)))
-                .observationHandler(
-                        new io.micrometer.observation.ObservationHandler.FirstMatchingCompositeObservationHandler(
-                                new DubboClientTracingObservationHandler<>(tracer),
-                                new DubboServerTracingObservationHandler<>(tracer)));
+                .observationHandler(new ObservationHandler.FirstMatchingCompositeObservationHandler(
+                        new PropagatingSenderTracingObservationHandler<>(tracer, propagator),
+                        new PropagatingReceiverTracingObservationHandler<>(tracer, propagator),
+                        new DefaultTracingObservationHandler(tracer)))
+                .observationHandler(new ObservationHandler.FirstMatchingCompositeObservationHandler(
+                        new DubboClientTracingObservationHandler<>(tracer),
+                        new DubboServerTracingObservationHandler<>(tracer)));
 
         if (MetricsSupportUtil.isSupportMetrics()) {
-            io.micrometer.core.instrument.MeterRegistry meterRegistry =
-                    MetricsGlobalRegistry.getCompositeRegistry(applicationModel);
-            registry.observationConfig()
-                    .observationHandler(new io.micrometer.core.instrument.observation.DefaultMeterObservationHandler(
-                            meterRegistry));
+            ObservationMeter.addMeterRegistry(registry, applicationModel);
         }
 
         applicationModel.getBeanFactory().registerBean(registry);

dubbo-metrics/dubbo-tracing/src/main/java/org/apache/dubbo/tracing/metrics/ObservationMeter.java

@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.tracing.metrics;
+
+import org.apache.dubbo.metrics.MetricsGlobalRegistry;
+import org.apache.dubbo.rpc.model.ApplicationModel;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.observation.ObservationRegistry;
+
+public class ObservationMeter {
+
+    public static void addMeterRegistry(ObservationRegistry registry, ApplicationModel applicationModel) {
+        MeterRegistry meterRegistry = MetricsGlobalRegistry.getCompositeRegistry(applicationModel);
+        registry.observationConfig()
+                .observationHandler(
+                        new io.micrometer.core.instrument.observation.DefaultMeterObservationHandler(meterRegistry));
+    }
+}