supress zipkin exporters instrumentations

exporters/zipkin/src/main/java/io/opentelemetry/exporter/zipkin/ZipkinSpanExporter.java

@@ -5,6 +5,7 @@
 
 package io.opentelemetry.exporter.zipkin;
 
+import io.opentelemetry.api.internal.InstrumentationUtil;
 import io.opentelemetry.api.metrics.MeterProvider;
 import io.opentelemetry.exporter.internal.ExporterMetrics;
 import io.opentelemetry.sdk.common.CompletableResultCode;
@@ -75,15 +76,20 @@ public CompletableResultCode export(Collection<SpanData> spanDataList) {
       encodedSpans.add(encoder.encode(zipkinSpan));
     }
 
-    try {
-      sender.send(encodedSpans);
-      exporterMetrics.addSuccess(numItems);
-      return CompletableResultCode.ofSuccess();
-    } catch (IOException | RuntimeException t) {
-      exporterMetrics.addFailed(numItems);
-      logger.log(Level.WARNING, "Failed to export spans", t);
-      return CompletableResultCode.ofFailure();
-    }
+    CompletableResultCode resultCode = new CompletableResultCode();
+    InstrumentationUtil.suppressInstrumentation(
+        () -> {
+          try {
+            sender.send(encodedSpans);
+            exporterMetrics.addSuccess(numItems);
+            resultCode.succeed();
+          } catch (IOException | RuntimeException e) {
+            exporterMetrics.addFailed(numItems);
+            logger.log(Level.WARNING, "Failed to export spans", e);
+            resultCode.fail();
+          }
+        });
+    return resultCode;
   }
 
   @Override

exporters/zipkin/src/test/java/io/opentelemetry/exporter/zipkin/ZipkinSpanExporterTest.java

@@ -9,20 +9,25 @@
 import static io.opentelemetry.exporter.zipkin.ZipkinTestUtil.zipkinSpanBuilder;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import io.github.netmikey.logunit.api.LogCapturer;
+import io.opentelemetry.api.internal.InstrumentationUtil;
 import io.opentelemetry.api.metrics.MeterProvider;
+import io.opentelemetry.context.Context;
 import io.opentelemetry.internal.testing.slf4j.SuppressLogger;
 import io.opentelemetry.sdk.common.CompletableResultCode;
 import io.opentelemetry.sdk.testing.trace.TestSpanData;
 import java.io.IOException;
 import java.net.InetAddress;
 import java.time.Duration;
 import java.util.Collections;
+import java.util.List;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -244,4 +249,57 @@ void stringRepresentation() {
               "ZipkinSpanExporter{endpoint=http://zipkin:9411/api/v2/spans, compressionEnabled=false, readTimeoutMillis=15000}");
     }
   }
+
+  @Test
+  void suppressInstrumentation() {
+    TestSpanData testSpanData = spanBuilder().build();
+
+    SuppressCatchingSender suppressCatchingSender = new SuppressCatchingSender(Encoding.JSON);
+    ZipkinSpanExporter zipkinSpanExporter =
+        new ZipkinSpanExporter(
+            new ZipkinSpanExporterBuilder(),
+            mockEncoder,
+            suppressCatchingSender,
+            MeterProvider::noop,
+            mockTransformer);
+
+    byte[] someBytes = new byte[0];
+    Span zipkinSpan =
+        zipkinSpanBuilder(Span.Kind.SERVER, localIp)
+            .putTag(OtelToZipkinSpanTransformer.OTEL_STATUS_CODE, "OK")
+            .build();
+    when(mockTransformer.generateSpan(testSpanData)).thenReturn(zipkinSpan);
+    when(mockEncoder.encode(zipkinSpan)).thenReturn(someBytes);
+
+    zipkinSpanExporter.export(Collections.singleton(testSpanData));
+
+    // Instrumentation should be suppressed on send, to avoid incidental spans related to span
+    // export.
+    assertTrue(suppressCatchingSender.sent.get());
+    assertTrue(suppressCatchingSender.suppressed.get());
+  }
+
+  static class SuppressCatchingSender extends BytesMessageSender.Base {
+
+    final AtomicBoolean sent = new AtomicBoolean();
+    final AtomicBoolean suppressed = new AtomicBoolean();
+
+    protected SuppressCatchingSender(Encoding encoding) {
+      super(encoding);
+    }
+
+    @Override
+    public int messageMaxBytes() {
+      return 1024;
+    }
+
+    @Override
+    public void send(List<byte[]> list) throws IOException {
+      sent.set(true);
+      suppressed.set(InstrumentationUtil.shouldSuppressInstrumentation(Context.current()));
+    }
+
+    @Override
+    public void close() throws IOException {}
+  }
 }