use devnull exporter

plugins/telemetry-otel/src/main/java/org/opensearch/telemetry/tracing/FileSpanExporter.java

@@ -0,0 +1,90 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.telemetry.tracing;
+
+import io.opentelemetry.sdk.common.CompletableResultCode;
+import io.opentelemetry.sdk.common.InstrumentationScopeInfo;
+import io.opentelemetry.sdk.trace.data.SpanData;
+import io.opentelemetry.sdk.trace.export.SpanExporter;
+import java.util.Collection;
+import java.util.concurrent.atomic.AtomicBoolean;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+/**
+ * Writes the span to a log file. This is mostly for testing where you can trace one request and all your spans
+ * will be written to a file. Tracing log file would be available in the logs directory.
+ */
+public class FileSpanExporter implements SpanExporter {
+    /**
+     * jfkdfj
+     */
+    public static final String TRACING_LOG_PREFIX = "tracing_log";
+    private static final Logger TRACING_LOGGER = LogManager.getLogger(TRACING_LOG_PREFIX);
+    private final Logger DEFAULT_LOGGER = LogManager.getLogger(FileSpanExporter.class);
+    private final String FIELD_SEPARATOR = "\t";
+
+    private final AtomicBoolean isShutdown = new AtomicBoolean();
+
+    /**
+     * fjkdjf
+     */
+    public FileSpanExporter() {
+    }
+
+    @Override
+    public CompletableResultCode export(Collection<SpanData> spans) {
+        if (isShutdown.get()) {
+            return CompletableResultCode.ofFailure();
+        }
+        StringBuilder sb = new StringBuilder(128);
+        for (SpanData span : spans) {
+            sb.setLength(0);
+            InstrumentationScopeInfo instrumentationScopeInfo = span.getInstrumentationScopeInfo();
+            sb.append("'")
+                .append(span.getName())
+                .append("'")
+                .append(FIELD_SEPARATOR)
+                .append(span.getTraceId())
+                .append(FIELD_SEPARATOR)
+                .append(span.getSpanId())
+                .append(FIELD_SEPARATOR)
+                .append(span.getParentSpanId())
+                .append(FIELD_SEPARATOR)
+                .append(span.getKind())
+                .append(FIELD_SEPARATOR)
+                .append(span.getStartEpochNanos())
+                .append(FIELD_SEPARATOR)
+                .append(span.getEndEpochNanos())
+                .append(FIELD_SEPARATOR)
+                .append("[tracer:")
+                .append(instrumentationScopeInfo.getName())
+                .append(":")
+                .append(instrumentationScopeInfo.getVersion() == null ? "" : instrumentationScopeInfo.getVersion())
+                .append("]")
+                .append(FIELD_SEPARATOR)
+                .append(span.getAttributes());
+//            TRACING_LOGGER.info(sb.toString());
+        }
+        return CompletableResultCode.ofSuccess();
+    }
+
+    @Override
+    public CompletableResultCode flush() {
+        return CompletableResultCode.ofSuccess();
+    }
+
+    @Override
+    public CompletableResultCode shutdown() {
+        if (!isShutdown.compareAndSet(false, true)) {
+            DEFAULT_LOGGER.info("Duplicate shutdown() calls.");
+        }
+        return CompletableResultCode.ofSuccess();
+    }
+}

plugins/telemetry-otel/src/main/java/org/opensearch/telemetry/tracing/OTelResourceProvider.java

@@ -42,7 +42,7 @@ private OTelResourceProvider() {}
     public static OpenTelemetry get(Settings settings) {
         return get(
             settings,
-            new LoggingSpanExporter(),
+            new FileSpanExporter(),
             ContextPropagators.create(W3CTraceContextPropagator.getInstance()),
             Sampler.alwaysOn()
         );