Remove global traceId in Segment.

apm-network/src/main/proto/TraceSegmentService.proto

@@ -19,10 +19,9 @@ message UpstreamSegment {
 message TraceSegmentObject {
     string traceSegmentId = 1;
     repeated TraceSegmentReference refs = 2;
-    repeated string globalTraceIds = 3;
-    repeated SpanObject spans = 4;
-    int32 applicationId = 5;
-    int32 applicationInstanceId = 6;
+    repeated SpanObject spans = 3;
+    int32 applicationId = 4;
+    int32 applicationInstanceId = 5;
 }
 
 message TraceSegmentReference {

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/trace/TraceSegment.java

@@ -203,10 +203,6 @@ public class TraceSegment {
                 traceSegmentBuilder.addRefs(ref.transform());
             }
         }
-        // globalTraceIds
-        for (DistributedTraceId distributedTraceId : getRelatedGlobalTraces()) {
-            traceSegmentBuilder.addGlobalTraceIds(distributedTraceId.get());
-        }
         // SpanObject
         for (AbstractTracingSpan span : this.spans) {
             traceSegmentBuilder.addSpans(span.transform());