Create sentry-opentelemetry-otlp module for comining OpenTelemetry SDK OTLP export with Sentry SDK

.craft.yml

@@ -48,6 +48,7 @@ targets:
       maven:io.sentry:sentry-opentelemetry-agentless-spring:
       maven:io.sentry:sentry-opentelemetry-bootstrap:
       maven:io.sentry:sentry-opentelemetry-core:
+#      maven:io.sentry:sentry-opentelemetry-otlp:
       maven:io.sentry:sentry-apollo:
       maven:io.sentry:sentry-jdbc:
       maven:io.sentry:sentry-graphql:

.cursor/rules/opentelemetry.mdc

@@ -14,6 +14,7 @@ The Sentry Java SDK provides comprehensive OpenTelemetry integration through mul
 - `sentry-opentelemetry-agentless-spring`: Spring-specific agentless integration
 - `sentry-opentelemetry-bootstrap`: Classes that go into the bootstrap classloader when the agent is used. For agentless they are simply used in the applications classloader.
 - `sentry-opentelemetry-agentcustomization`: Classes that help wire up Sentry in OpenTelemetry. These land in the agent classloader when the agent is used. For agentless they are simply used in the application classloader.
+- `sentry-opentelemetry-otlp`: Classes for using OpenTelemetry to send spans to Sentry using the OTLP endpoint and have Sentry use OpenTelemetry trace and span id.
 
 ## Advantages over using Sentry without OpenTelemetry
 
@@ -86,3 +87,9 @@ After creating the transaction with child spans `SentrySpanExporter` uses Sentry
 ## Troubleshooting
 
 To debug forking of `Scopes`, we added a reference to `parent` `Scopes` and a `creator` String to store the reason why `Scopes` were created or forked.
+
+# OTLP
+When using `sentry-opentelemetry-otlp`, Sentry only loads trace ID and span ID from OpenTelemetry `Context` (via `OpenTelemetryOtlpEventProcessor`). Sentry does not rely on OpenTelemetry `Context` for scope storage and propagation, instead relying on its `DefaultScopesStorage`.
+It is common to keep Performance in Sentry SDK disabled since that part is taken over by OpenTelemetry.
+The `sentry-opentelemetry-otlp` module is not connected to the other `sentry-opentelemetry-*` modules but instead intended only when the goal is to run OpenTelemetry for creating spans and Sentry for other products like errors, logs, metrics etc.
+The OTLP module does not easily work with the OpenTelemetry agent as it would require customizing the agent.JAR in order to get the propagator loaded.

.github/workflows/system-tests-backend.yml

@@ -54,6 +54,9 @@ jobs:
           - sample: "sentry-samples-console"
             agent: "false"
             agent-auto-init: "true"
+          - sample: "sentry-samples-console-otlp"
+            agent: "false"
+            agent-auto-init: "true"
           - sample: "sentry-samples-logback"
             agent: "false"
             agent-auto-init: "true"
@@ -78,6 +81,9 @@ jobs:
           - sample: "sentry-samples-spring-boot-4-opentelemetry"
             agent: "true"
             agent-auto-init: "false"
+          - sample: "sentry-samples-spring-boot-4-otlp"
+            agent: "false"
+            agent-auto-init: "true"
           - sample: "sentry-samples-spring-7"
             agent: "false"
             agent-auto-init: "true"

README.md

@@ -65,6 +65,7 @@ Sentry SDK for Java and Android
 | sentry-opentelemetry-agent              | ![Maven Central Version](https://img.shields.io/maven-central/v/io.sentry/sentry-opentelemetry-agent?style=for-the-badge&logo=sentry&color=green)              |
 | sentry-opentelemetry-agentcustomization | ![Maven Central Version](https://img.shields.io/maven-central/v/io.sentry/sentry-opentelemetry-agentcustomization?style=for-the-badge&logo=sentry&color=green) |
 | sentry-opentelemetry-core               | ![Maven Central Version](https://img.shields.io/maven-central/v/io.sentry/sentry-opentelemetry-core?style=for-the-badge&logo=sentry&color=green)               |
+| sentry-opentelemetry-otlp               | ![Maven Central Version](https://img.shields.io/maven-central/v/io.sentry/sentry-opentelemetry-otlp?style=for-the-badge&logo=sentry&color=green)               |
 | sentry-okhttp                           | ![Maven Central Version](https://img.shields.io/maven-central/v/io.sentry/sentry-okhttp?style=for-the-badge&logo=sentry&color=green)                           |
 | sentry-reactor                          | ![Maven Central Version](https://img.shields.io/maven-central/v/io.sentry/sentry-reactor?style=for-the-badge&logo=sentry&color=green)                          |
 | sentry-spotlight                        | ![Maven Central Version](https://img.shields.io/maven-central/v/io.sentry/sentry-spotlight?style=for-the-badge&logo=sentry&color=green)                        |

build.gradle.kts

@@ -77,6 +77,7 @@ apiValidation {
             "sentry-samples-spring-boot-4",
             "sentry-samples-spring-boot-4-opentelemetry",
             "sentry-samples-spring-boot-4-opentelemetry-noagent",
+            "sentry-samples-spring-boot-4-otlp",
             "sentry-samples-spring-boot-4-webflux",
             "sentry-samples-ktor-client",
             "sentry-uitest-android",
@@ -85,7 +86,8 @@ apiValidation {
             "test-app-plain",
             "test-app-sentry",
             "test-app-size",
-            "sentry-samples-netflix-dgs"
+            "sentry-samples-netflix-dgs",
+            "sentry-samples-console-otlp"
         )
     )
 }

buildSrc/src/main/java/Config.kt

@@ -64,6 +64,7 @@ object Config {
         val SENTRY_SPRING_BOOT_4_STARTER_SDK_NAME = "$SENTRY_JAVA_SDK_NAME.spring-boot-4-starter"
         val SENTRY_OPENTELEMETRY_BOOTSTRAP_SDK_NAME = "$SENTRY_JAVA_SDK_NAME.opentelemetry.bootstrap"
         val SENTRY_OPENTELEMETRY_CORE_SDK_NAME = "$SENTRY_JAVA_SDK_NAME.opentelemetry.core"
+        val SENTRY_OPENTELEMETRY_OTLP_SDK_NAME = "$SENTRY_JAVA_SDK_NAME.opentelemetry.otlp"
         val SENTRY_OPENTELEMETRY_AGENT_SDK_NAME = "$SENTRY_JAVA_SDK_NAME.opentelemetry.agent"
         val SENTRY_OPENTELEMETRY_AGENTLESS_SDK_NAME = "$SENTRY_JAVA_SDK_NAME.opentelemetry.agentless"
         val SENTRY_OPENTELEMETRY_AGENTLESS_SPRING_SDK_NAME = "$SENTRY_JAVA_SDK_NAME.opentelemetry.agentless-spring"

gradle/libs.versions.toml

@@ -134,6 +134,8 @@ okhttp = { module = "com.squareup.okhttp3:okhttp", version.ref = "okhttp" }
 okhttp-bom = { module = "com.squareup.okhttp3:okhttp-bom", version.ref = "okhttp" }
 openfeature = { module = "dev.openfeature:sdk", version.ref = "openfeature" }
 otel = { module = "io.opentelemetry:opentelemetry-sdk", version.ref = "otel" }
+otel-exporter-otlp = { module = "io.opentelemetry:opentelemetry-exporter-otlp", version.ref = "otel" }
+otel-exporter-logging = { module = "io.opentelemetry:opentelemetry-exporter-logging", version.ref = "otel" }
 otel-extension-autoconfigure = { module = "io.opentelemetry:opentelemetry-sdk-extension-autoconfigure", version.ref = "otel" }
 otel-extension-autoconfigure-spi = { module = "io.opentelemetry:opentelemetry-sdk-extension-autoconfigure-spi", version.ref = "otel" }
 otel-instrumentation-bom = { module = "io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom", version.ref = "otelInstrumentation" }

sentry-opentelemetry/sentry-opentelemetry-otlp/README.md

@@ -0,0 +1,7 @@
+# sentry-opentelemetry-otlp
+
+This module provides a lightweight integration for using OpenTelemetry alongside the Sentry SDK. It reads trace and span IDs from the OpenTelemetry `Context` so that Sentry events (errors, logs, metrics) are correlated with OpenTelemetry traces.
+
+Unlike the other `sentry-opentelemetry-*` modules, this module does not rely on OpenTelemetry for scope storage or span creation. It is intended for setups where OpenTelemetry handles performance/tracing and Sentry handles errors, logs, metrics, and other products.
+
+Please consult the documentation on how to install and use this integration in the [Sentry Docs for Java](https://docs.sentry.io/platforms/java/).

sentry-opentelemetry/sentry-opentelemetry-otlp/api/sentry-opentelemetry-otlp.api

@@ -0,0 +1,16 @@
+public final class io/sentry/opentelemetry/otlp/OpenTelemetryOtlpEventProcessor : io/sentry/EventProcessor {
+	public fun <init> ()V
+	public fun getOrder ()Ljava/lang/Long;
+	public fun process (Lio/sentry/SentryEvent;Lio/sentry/Hint;)Lio/sentry/SentryEvent;
+	public fun process (Lio/sentry/SentryLogEvent;)Lio/sentry/SentryLogEvent;
+	public fun process (Lio/sentry/SentryMetricsEvent;Lio/sentry/Hint;)Lio/sentry/SentryMetricsEvent;
+}
+
+public final class io/sentry/opentelemetry/otlp/OpenTelemetryOtlpPropagator : io/opentelemetry/context/propagation/TextMapPropagator {
+	public static final field SENTRY_BAGGAGE_KEY Lio/opentelemetry/context/ContextKey;
+	public fun <init> ()V
+	public fun extract (Lio/opentelemetry/context/Context;Ljava/lang/Object;Lio/opentelemetry/context/propagation/TextMapGetter;)Lio/opentelemetry/context/Context;
+	public fun fields ()Ljava/util/Collection;
+	public fun inject (Lio/opentelemetry/context/Context;Ljava/lang/Object;Lio/opentelemetry/context/propagation/TextMapSetter;)V
+}
+

sentry-opentelemetry/sentry-opentelemetry-otlp/build.gradle.kts

@@ -0,0 +1,81 @@
+import net.ltgt.gradle.errorprone.errorprone
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+  `java-library`
+  id("io.sentry.javadoc")
+  alias(libs.plugins.kotlin.jvm)
+  jacoco
+  alias(libs.plugins.errorprone)
+  alias(libs.plugins.gradle.versions)
+}
+
+tasks.withType<KotlinCompile>().configureEach {
+  compilerOptions.jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_1_8
+}
+
+dependencies {
+  api(projects.sentry)
+
+  compileOnly(libs.otel)
+  //  compileOnly(libs.otel.semconv)
+  //  compileOnly(libs.otel.semconv.incubating)
+
+  compileOnly(libs.jetbrains.annotations)
+  compileOnly(libs.nopen.annotations)
+  errorprone(libs.errorprone.core)
+  errorprone(libs.nopen.checker)
+  errorprone(libs.nullaway)
+
+  // tests
+  testImplementation(projects.sentryTestSupport)
+  testImplementation(kotlin(Config.kotlinStdLib))
+  testImplementation(libs.awaitility.kotlin)
+  testImplementation(libs.kotlin.test.junit)
+  testImplementation(libs.mockito.kotlin)
+
+  testImplementation(libs.otel)
+  //  testImplementation(libs.otel.semconv)
+  //  testImplementation(libs.otel.semconv.incubating)
+}
+
+configure<SourceSetContainer> { test { java.srcDir("src/test/java") } }
+
+jacoco { toolVersion = libs.versions.jacoco.get() }
+
+tasks.jacocoTestReport {
+  reports {
+    xml.required.set(true)
+    html.required.set(false)
+  }
+}
+
+tasks {
+  jacocoTestCoverageVerification {
+    violationRules { rule { limit { minimum = Config.QualityPlugins.Jacoco.minimumCoverage } } }
+  }
+  check {
+    dependsOn(jacocoTestCoverageVerification)
+    dependsOn(jacocoTestReport)
+  }
+}
+
+tasks.withType<JavaCompile>().configureEach {
+  options.errorprone {
+    check("NullAway", net.ltgt.gradle.errorprone.CheckSeverity.ERROR)
+    option("NullAway:AnnotatedPackages", "io.sentry")
+  }
+}
+
+tasks.jar {
+  manifest {
+    attributes(
+      "Sentry-Version-Name" to project.version,
+      "Sentry-SDK-Name" to Config.Sentry.SENTRY_OPENTELEMETRY_OTLP_SDK_NAME,
+      "Sentry-SDK-Package-Name" to "maven:io.sentry:sentry-opentelemetry-otlp",
+      "Implementation-Vendor" to "Sentry",
+      "Implementation-Title" to project.name,
+      "Implementation-Version" to project.version,
+    )
+  }
+}

sentry-opentelemetry/sentry-opentelemetry-otlp/src/main/java/io/sentry/opentelemetry/otlp/OpenTelemetryOtlpEventProcessor.java

@@ -0,0 +1,120 @@
+package io.sentry.opentelemetry.otlp;
+
+import io.opentelemetry.api.trace.Span;
+import io.opentelemetry.api.trace.SpanId;
+import io.opentelemetry.api.trace.TraceId;
+import io.sentry.EventProcessor;
+import io.sentry.Hint;
+import io.sentry.IScopes;
+import io.sentry.ScopesAdapter;
+import io.sentry.SentryEvent;
+import io.sentry.SentryLevel;
+import io.sentry.SentryLogEvent;
+import io.sentry.SentryMetricsEvent;
+import io.sentry.SpanContext;
+import io.sentry.protocol.SentryId;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.TestOnly;
+
+public final class OpenTelemetryOtlpEventProcessor implements EventProcessor {
+
+  private final @NotNull IScopes scopes;
+
+  public OpenTelemetryOtlpEventProcessor() {
+    this(ScopesAdapter.getInstance());
+  }
+
+  @TestOnly
+  OpenTelemetryOtlpEventProcessor(final @NotNull IScopes scopes) {
+    this.scopes = scopes;
+  }
+
+  @Override
+  public @Nullable SentryEvent process(final @NotNull SentryEvent event, final @NotNull Hint hint) {
+    @NotNull final Span otelSpan = Span.current();
+    @NotNull final String traceId = otelSpan.getSpanContext().getTraceId();
+    @NotNull final String spanId = otelSpan.getSpanContext().getSpanId();
+
+    if (TraceId.isValid(traceId) && SpanId.isValid(spanId)) {
+      final @NotNull SpanContext spanContext =
+          new SpanContext(
+              new SentryId(traceId), new io.sentry.SpanId(spanId), "opentelemetry", null, null);
+
+      event.getContexts().setTrace(spanContext);
+      scopes
+          .getOptions()
+          .getLogger()
+          .log(
+              SentryLevel.DEBUG,
+              "Linking Sentry event %s to span %s created via OpenTelemetry (trace %s).",
+              event.getEventId(),
+              spanId,
+              traceId);
+    } else {
+      scopes
+          .getOptions()
+          .getLogger()
+          .log(
+              SentryLevel.DEBUG,
+              "Not linking Sentry event %s to any transaction created via OpenTelemetry as traceId %s or spanId %s are invalid.",
+              event.getEventId(),
+              traceId,
+              spanId);
+    }
+
+    return event;
+  }
+
+  @Override
+  public @Nullable SentryLogEvent process(@NotNull SentryLogEvent event) {
+    @NotNull final Span otelSpan = Span.current();
+    @NotNull final String traceId = otelSpan.getSpanContext().getTraceId();
+    @NotNull final String spanId = otelSpan.getSpanContext().getSpanId();
+
+    if (TraceId.isValid(traceId) && SpanId.isValid(spanId)) {
+      event.setTraceId(new SentryId(traceId));
+      event.setSpanId(new io.sentry.SpanId(spanId));
+    } else {
+      scopes
+          .getOptions()
+          .getLogger()
+          .log(
+              SentryLevel.DEBUG,
+              "Not linking Sentry event to any transaction created via OpenTelemetry as traceId %s or spanId %s are invalid.",
+              traceId,
+              spanId);
+    }
+
+    return event;
+  }
+
+  @Override
+  public @Nullable SentryMetricsEvent process(
+      @NotNull SentryMetricsEvent event, @NotNull Hint hint) {
+    @NotNull final Span otelSpan = Span.current();
+    @NotNull final String traceId = otelSpan.getSpanContext().getTraceId();
+    @NotNull final String spanId = otelSpan.getSpanContext().getSpanId();
+
+    if (TraceId.isValid(traceId) && SpanId.isValid(spanId)) {
+      event.setTraceId(new SentryId(traceId));
+      event.setSpanId(new io.sentry.SpanId(spanId));
+    } else {
+      scopes
+          .getOptions()
+          .getLogger()
+          .log(
+              SentryLevel.DEBUG,
+              "Not linking Sentry event to any transaction created via OpenTelemetry as traceId %s or spanId %s are invalid.",
+              traceId,
+              spanId);
+    }
+
+    return event;
+  }
+
+  @Override
+  public @Nullable Long getOrder() {
+    return 6000L;
+  }
+}