{"id":45201216,"url":"https://github.com/last9/vertx-opentelemetry","last_synced_at":"2026-04-13T14:01:33.795Z","repository":{"id":338961129,"uuid":"1151150691","full_name":"last9/vertx-opentelemetry","owner":"last9","description":"Zero-code OpenTelemetry auto-instrumentation for Vert.x 4 + RxJava 3 and Vert.x 3 + RxJava 2. 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Get traces, metrics, and logs. No code changes.\n\n| Stack | Agent |\n|-------|-------|\n| Vert.x 3.9+ / RxJava 2 | `vertx3-otel-agent.jar` |\n| Vert.x 4.5+ / RxJava 3 | `vertx4-otel-agent.jar` |\n\n## Get started\n\n```bash\nexport OTEL_SERVICE_NAME=my-service\nexport OTEL_EXPORTER_OTLP_ENDPOINT=https://otlp.last9.io\nexport OTEL_EXPORTER_OTLP_HEADERS=\"Authorization=Basic \u003ctoken\u003e\"\n\njava -javaagent:vertx3-otel-agent.jar -jar my-app.jar\n```\n\nThat's it. Every HTTP endpoint, database query, Kafka message, cache operation, and outbound HTTP call is traced automatically.\n\nDownload the latest agent from [Releases](https://github.com/last9/vertx-opentelemetry/releases):\n\n```bash\n# Vert.x 3\ncurl -L -o vertx3-otel-agent.jar \\\n  https://github.com/last9/vertx-opentelemetry/releases/download/v2.3.4/vertx3-otel-agent-2.3.4.jar\n\n# Vert.x 4\ncurl -L -o vertx4-otel-agent.jar \\\n  https://github.com/last9/vertx-opentelemetry/releases/download/v2.3.4/vertx4-otel-agent-2.3.4.jar\n```\n\n## What gets instrumented\n\n### Vert.x 3\n\nByteBuddy instruments these at class-load time — no wrappers, no annotations, no XML:\n\n| Component | Span Kind | Key Attributes |\n|-----------|-----------|---------------|\n| Netty HTTP server | SERVER | `http.request.method`, `url.path`, `http.response.status_code` |\n| Router (RxJava2 + core) | SERVER | `http.route` (pattern, not literal path) |\n| WebClient | CLIENT | `url.full`, `server.address`, `http.response.status_code` |\n| JDBCClient | CLIENT | `db.system`, `db.name`, `db.statement` |\n| KafkaProducer | PRODUCER | `messaging.destination.name` |\n| KafkaConsumer | CONSUMER | `messaging.batch.message_count` |\n| AerospikeClient | CLIENT | `db.system=aerospike`, `net.peer.name` |\n| MySQLPool / PgPool | CLIENT | `db.system`, `db.statement` |\n| Jedis (Pool, Cluster, Pipeline) | CLIENT | `db.system=redis`, `db.statement` |\n| Lettuce (sync/async/reactive) | CLIENT | `db.system=redis`, `db.statement` |\n| Raw JDBC (`Statement.execute*`) | CLIENT | `db.system` (auto-detected), `db.statement` |\n| Netty HTTP client | CLIENT | `http.method`, `net.peer.name` |\n| RESTEasy (JAX-RS) | — | `@Path` templates → `http.route` |\n| AWS SQS (SDK v1 + v2) | CONSUMER | `messaging.system=AmazonSQS` |\n\n### Vert.x 4\n\nThe agent injects `TracingOptions` at startup, activating the native `VertxTracer` SPI. No ByteBuddy needed for the core stack:\n\n| Component | How | What you get |\n|-----------|-----|-------------|\n| HTTP server | VertxTracer SPI | SERVER spans for every request |\n| HTTP client | VertxTracer SPI | CLIENT spans + `traceparent` injection |\n| EventBus | VertxTracer SPI | INTERNAL spans for send/publish |\n| SQL client (PgPool, MySQLPool) | VertxTracer SPI | CLIENT spans with SQL |\n| Redis client | VertxTracer SPI | CLIENT spans |\n| Kafka | VertxTracer SPI | PRODUCER/CONSUMER spans |\n| Router | ByteBuddy | Route patterns: `GET /v1/users/:id` |\n| Vert.x metrics | Micrometer → OTel bridge | HTTP pools, event bus, event loop lag |\n| Jedis, Lettuce, JDBC, Aerospike, RESTEasy, SQS | ByteBuddy | Same as v3 |\n\n### Across all agents\n\n- **RxJava context propagation** — trace context flows across `subscribeOn`, `observeOn`, `flatMap`\n- **W3C `traceparent`** — injected on every outgoing HTTP and Kafka call\n- **Log-trace correlation** — `trace_id` and `span_id` auto-injected into every Logback line. No `logback.xml` changes.\n- **JVM metrics** — memory, GC, threads, CPU\n- **Cloud resource detection** — AWS (EC2, ECS, EKS) and GCP (GCE, GKE, Cloud Run)\n\n## Why not the OpenTelemetry Java Agent?\n\nThe OTel Java Agent assumes `ThreadLocal` context propagation. Vert.x doesn't use `ThreadLocal`. The result: broken spans on async HTTP calls ([#11860](https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/11860)), lost context across RxJava operators, and broken virtual thread support on Java 21 ([#10526](https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/10526)).\n\nThis library works with Vert.x's event-loop model — handler-based instrumentation for v3, native `VertxTracer` SPI for v4, RxJava assembly hooks for context propagation across all operators.\n\n## Java compatibility\n\n**Java 8+.** The agent uses the OkHttp-based OTLP sender (shaded as `io.last9.internal.okhttp3`) instead of `java.net.http.HttpClient`. Same JAR on Java 8, 11, 17, 21.\n\n## Deployment\n\n### EC2 / Bare metal\n\n```bash\ncurl -L -o /opt/otel/vertx3-otel-agent.jar \\\n  https://github.com/last9/vertx-opentelemetry/releases/download/v2.3.4/vertx3-otel-agent-2.3.4.jar\n\njava -javaagent:/opt/otel/vertx3-otel-agent.jar -jar /opt/app/my-app.jar\n```\n\n### Docker / Kubernetes\n\n```dockerfile\nFROM eclipse-temurin:11-jre-alpine\nCOPY target/my-app.jar /app/my-app.jar\nCOPY vertx3-otel-agent.jar /app/vertx3-otel-agent.jar\nCMD [\"java\", \"-javaagent:/app/vertx3-otel-agent.jar\", \"-jar\", \"/app/my-app.jar\"]\n```\n\n## How it works\n\n1. A 2-class shim (`AgentBootstrap`) loads on the system classloader — compiled to Java 8 bytecode\n2. The embedded library JAR (`agent-impl.jar`) is injected onto the system classloader\n3. All OTel SDK, ByteBuddy, and OkHttp classes are shaded under `io.last9.internal.*` — no classpath conflicts even if your app bundles its own OTel SDK\n4. ByteBuddy transformers intercept Vert.x APIs at load time\n5. RxJava context propagation hooks are installed automatically\n6. Log-trace correlation is auto-installed into Logback\n\n**No Maven dependency required.** Drop the JAR and go.\n\n\u003e **Do not add `io.last9:vertx3-rxjava2-otel-autoconfigure` (or the v4 equivalent) as a Maven dependency when using `-javaagent`.** The app's unshaded classes will shadow the agent's shaded ones — you'll get a no-op tracer and zero spans.\n\n## Configuration\n\nAll standard [OpenTelemetry environment variables](https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/) work:\n\n| Variable | Default |\n|----------|---------|\n| `OTEL_SERVICE_NAME` | `unknown-service` |\n| `OTEL_EXPORTER_OTLP_ENDPOINT` | `http://localhost:4318` |\n| `OTEL_EXPORTER_OTLP_HEADERS` | — |\n| `OTEL_EXPORTER_OTLP_TIMEOUT` | `10000` |\n| `OTEL_RESOURCE_ATTRIBUTES` | — |\n| `OTEL_TRACES_SAMPLER` | `parentbased_always_on` |\n| `OTEL_LOGS_EXPORTER` | `otlp` |\n| `OTEL_METRICS_EXPORTER` | `otlp` |\n| `OTEL_METRIC_EXPORT_INTERVAL` | `60000` |\n| `OTEL_BSP_SCHEDULE_DELAY` | `5000` |\n\nSet `OTEL_EXPORTER_OTLP_TIMEOUT=30000` when exporting to remote backends.\n\n## Troubleshooting\n\n**Disconnected traces (outgoing calls show as separate root spans)**\n\n1. Look for `bytecode instrumentation installed` in logs — confirms the agent loaded\n2. Look for `RxJava context propagation installed` — confirms async context flows\n3. Verify the downstream service is also OTel-instrumented and reads `traceparent`\n\n**No spans exported**\n\n1. Check `OTEL_EXPORTER_OTLP_ENDPOINT` is reachable\n2. Check `OTEL_EXPORTER_OTLP_HEADERS` auth is correct\n3. Look for `Connection refused` in stderr\n4. Set `OTEL_LOG_LEVEL=debug` for verbose export logs\n\n**CLIENT spans present but no SERVER spans**\n\n1. Look for `transformed io.vertx.reactivex.ext.web.Router (loaded=false)` and `HttpServerAdviceHelper: wrapping requestHandler` in logs\n2. Look for `Tracer OK (io.last9.internal.otel.sdk.trace.SdkTracer)` on stderr — if you see `Tracer is NO-OP`, SDK init failed\n3. Look for `WARNING: HttpServerAdviceHelper is missing version marker` — this means the app bundles a conflicting `io.last9` library dependency. Remove it.\n\n## Requirements\n\n| Agent | Java | Vert.x | RxJava |\n|-------|------|--------|--------|\n| `vertx3-otel-agent` | 8+ | 3.9+ | 2.x |\n| `vertx4-otel-agent` | 11+ | 4.5+ | 3.x |\n\n---\n\n\u003cdetails\u003e\n\u003csummary\u003e\u003ch2\u003eLibrary Mode\u003c/h2\u003e\u003c/summary\u003e\n\n\u003e Use the agent. Library mode exists for environments where `-javaagent` is not feasible.\n\n### Vert.x 4\n\n```xml\n\u003cdependency\u003e\n    \u003cgroupId\u003eio.last9\u003c/groupId\u003e\n    \u003cartifactId\u003evertx4-rxjava3-otel-autoconfigure\u003c/artifactId\u003e\n    \u003cversion\u003e2.3.4\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n```java\n// Use OtelLauncher as main class\n// \u003cmainClass\u003eio.last9.tracing.otel.v4.OtelLauncher\u003c/mainClass\u003e\n\nRouter router = TracedRouter.create(vertx);\nTracedDBPool traced = TracedDBPool.wrap(PgPool.pool(vertx, opts, poolOpts), \"postgresql\", \"mydb\");\nconsumer.batchHandler(KafkaTracing.tracedBatchHandler(topicName, this::handleBatch));\n```\n\n### Vert.x 3\n\n```xml\n\u003cdependency\u003e\n    \u003cgroupId\u003eio.last9\u003c/groupId\u003e\n    \u003cartifactId\u003evertx3-rxjava2-otel-autoconfigure\u003c/artifactId\u003e\n    \u003cversion\u003e2.3.4\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n```java\n// \u003cmainClass\u003eio.last9.tracing.otel.v3.OtelLauncher\u003c/mainClass\u003e\n\nRouter router = TracedRouter.create(vertx);\nWebClient client = TracedWebClient.create(vertx);\nSQLClient sql = TracedSQLClient.wrap(JDBCClient.createShared(vertx, config), \"mysql\", \"mydb\");\nTracedAerospikeClient aero = TracedAerospikeClient.wrap(new AerospikeClient(\"localhost\", 3000), \"ns\");\nTracedKafkaProducer\u003cString, String\u003e producer = TracedKafkaProducer.wrap(KafkaProducer.create(vertx, config));\nTracedKafkaConsumer.create(vertx, config, \"topic\", \"group\", records -\u003e { ... });\n```\n\n### Manual SDK init (custom main class)\n\n```java\nimport io.last9.tracing.otel.OtelSdkSetup;\nimport io.last9.tracing.otel.v3.RxJava2ContextPropagation; // or v4.RxJava3ContextPropagation\n\nOtelSdkSetup.initialize();\nRxJava2ContextPropagation.install();\n```\n\n\u003c/details\u003e\n\n## License\n\nMIT\n\n## Support\n\n- [GitHub Issues](https://github.com/last9/vertx-opentelemetry/issues)\n- [Last9 Documentation](https://last9.io/docs)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flast9%2Fvertx-opentelemetry","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Flast9%2Fvertx-opentelemetry","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flast9%2Fvertx-opentelemetry/lists"}