Logging OpenTelemetry extension

docs/src/main/asciidoc/_includes/opentelemetry-config.adoc

@@ -1,5 +1,3 @@
-There are no mandatory configurations for the extension to work.
-
 By default, the exporters will send out data in batches, using the gRPC protocol and endpoint `http://localhost:4317`.
 
 If you need to change any of the default property values, here is an example on how to configure the default OTLP gRPC Exporter within the application, using the `src/main/resources/application.properties` file:
@@ -31,6 +29,8 @@ If you need different configurations for each signal, you can use the specific p
 ----
 quarkus.otel.exporter.otlp.traces.endpoint=http://trace-uri:4317 // <1>
 quarkus.otel.exporter.otlp.metrics.endpoint=http://metrics-uri:4317 // <2>
+quarkus.otel.exporter.otlp.logs.endpoint=http://logs-uri:4317 // <3>
 ----
 <1> The endpoint for the traces exporter.
 <2> The endpoint for the metrics exporter.
+<3> The endpoint for the logs exporter.

docs/src/main/asciidoc/logging.adoc

@@ -631,6 +631,11 @@ Use a centralized location to efficiently collect, store, and analyze log data f
 To send logs to a centralized tool such as Graylog, Logstash, or Fluentd, see the Quarkus xref:centralized-log-management.adoc[Centralized log management] guide.
 
 
+=== OpenTelemetry logging
+Logging entries from all appenders can be sent using OpenTelemetry Logging.
+
+For details, see the Quarkus xref:opentelemetry-logging.adoc[OpenTelemetry Logging] guide.
+
 == Configure logging for `@QuarkusTest`
 
 Enable proper logging for `@QuarkusTest` by setting the `java.util.logging.manager` system property to `org.jboss.logmanager.LogManager`.

docs/src/main/asciidoc/opentelemetry-logging.adoc

@@ -0,0 +1,173 @@
+////
+This guide is maintained in the main Quarkus repository
+and pull requests should be submitted there:
+https://github.com/quarkusio/quarkus/tree/main/docs/src/main/asciidoc
+////
+= Using OpenTelemetry Logging
+include::_attributes.adoc[]
+:categories: observability
+:summary: This guide explains how your Quarkus application can utilize OpenTelemetry Logging to provide distributed logging for interactive web applications.
+:topics: observability,opentelemetry,logging
+:extensions: io.quarkus:quarkus-opentelemetry
+
+This guide explains how your Quarkus application can utilize https://opentelemetry.io/[OpenTelemetry] (OTel) to provide
+distributed logging for interactive web applications.
+
+[NOTE]
+====
+- OpenTelemetry Logging is disabled by default.
+- The xref:opentelemetry.adoc[OpenTelemetry Guide] is available with signal independent information about the OpenTelemetry extension.
+====
+
+== Prerequisites
+
+:prerequisites-docker-compose:
+include::{includes}/prerequisites.adoc[]
+
+== Architecture
+
+In this guide, we create a straightforward REST application to demonstrate distributed logging, similar to the other OpenTelemetry guides.
+
+== Solution
+
+We recommend that you follow the instructions in the next sections and create the application step by step.
+However, you can skip right to the completed example.
+
+Clone the Git repository: `git clone {quickstarts-clone-url}`, or download an {quickstarts-archive-url}[archive].
+
+The solution is located in the `opentelemetry-quickstart` link:{quickstarts-tree-url}/opentelemetry-quickstart[directory].
+
+== Creating the Maven project
+
+First, we need a new project. Create a new project with the following command:
+
+:create-app-artifact-id: opentelemetry-quickstart
+:create-app-extensions: rest,quarkus-opentelemetry
+include::{includes}/devtools/create-app.adoc[]
+
+This command generates the Maven project and imports the `quarkus-opentelemetry` extension,
+which includes the default OpenTelemetry support,
+and a gRPC span exporter for https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/otlp.md[OTLP].
+
+If you already have your Quarkus project configured, you can add the `quarkus-opentelemetry` extension
+to your project by running the following command in your project base directory:
+
+:add-extension-extensions: opentelemetry
+include::{includes}/devtools/extension-add.adoc[]
+
+This will add the following to your build file:
+
+[source,xml,role="primary asciidoc-tabs-target-sync-cli asciidoc-tabs-target-sync-maven"]
+.pom.xml
+----
+<dependency>
+    <groupId>io.quarkus</groupId>
+    <artifactId>quarkus-opentelemetry</artifactId>
+</dependency>
+----
+
+[source,gradle,role="secondary asciidoc-tabs-target-sync-gradle"]
+.build.gradle
+----
+implementation("io.quarkus:quarkus-opentelemetry")
+----
+
+=== Examine the Jakarta REST resource
+
+Create a `src/main/java/org/acme/opentelemetry/TracedResource.java` file with the following content:
+
+[source,java]
+----
+package org.acme.opentelemetry;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.MediaType;
+import org.jboss.logging.Logger;
+
+@Path("/hello")
+public class TracedResource {
+
+    private static final Logger LOG = Logger.getLogger(TracedResource.class);
+
+    @GET
+    @Produces(MediaType.TEXT_PLAIN)
+    public String hello() {
+        LOG.info("hello");
+        return "hello";
+    }
+}
+----
+
+If you have followed the tracing guide, this class will seem familiar. The main difference is that now, the `hello` message logged with `org.jboss.logging.Logger` will end up in the OpenTelemetry logs.
+
+=== Create the configuration
+
+The only mandatory configuration for OpenTelemetry Logging is the one enabling it:
+[source,properties]
+----
+quarkus.otel.logs.enabled=true
+----
+
+To change any of the default property values, here is an example on how to configure the default OTLP gRPC Exporter within the application, using the `src/main/resources/application.properties` file:
+
+[source,properties]
+----
+quarkus.application.name=myservice // <1>
+quarkus.otel.logs.enabled=true // <2>
+quarkus.otel.exporter.otlp.logs.endpoint=http://localhost:4317 // <3>
+quarkus.otel.exporter.otlp.logs.headers=authorization=Bearer my_secret // <4>
+----
+
+<1> All logs created from the application will include an OpenTelemetry `Resource` indicating the logs were created by the `myservice` application.
+If not set, it will default to the artifact id.
+<2> Enable the OpenTelemetry logging.
+Must be set at build time.
+<3> gRPC endpoint to send the logs.
+If not set, it will default to `http://localhost:4317`.
+<4> Optional gRPC headers commonly used for authentication.
+
+To configure the connection using the same properties for all signals, please check the base xref:opentelemetry.adoc#create-the-configuration[configuration section of the OpenTelemetry guide].
+
+== Run the application
+
+First we need to start a system to visualise the OpenTelemetry data.
+We have 2 options:
+
+* Start an all-in-one Grafana OTel LGTM system for traces, metrics and logs.
+
+=== See the data
+
+==== Grafana OTel LGTM option
+
+* Take a look at: xref:observability-devservices-lgtm.adoc[Getting Started with Grafana-OTel-LGTM].
+
+This features a Quarkus Dev service including a Grafana for visualizing data, Loki to store logs, Tempo to store traces and Prometheus to store metrics. Also provides and OTel collector to receive the data.
+
+==== Logging exporter
+
+You can output all logs to the console by setting the exporter to `logging` in the `application.properties` file:
+[source, properties]
+----
+quarkus.otel.logs.exporter=logging <1>
+----
+
+<1> Set the exporter to `logging`.
+Normally you don't need to set this.
+The default is `cdi`.
+
+
+Also add this dependency to your project:
+[source,xml]
+----
+<dependency>
+    <groupId>io.opentelemetry</groupId>
+    <artifactId>opentelemetry-exporter-logging</artifactId>
+</dependency>
+----
+
+[[configuration-reference]]
+== OpenTelemetry Configuration Reference
+
+See the main xref:opentelemetry.adoc#configuration-reference[OpenTelemetry Guide configuration] reference.

docs/src/main/asciidoc/opentelemetry-metrics.adoc

@@ -15,6 +15,7 @@ metrics for interactive web applications.
 
 [NOTE]
 ====
+- OpenTelemetry Metrics is disabled by default and Quarkus does not produce automatic metrics for it.
 - The xref:opentelemetry.adoc[OpenTelemetry Guide] is available with signal independent information about the OpenTelemetry extension.
 - If you search more information about OpenTelemetry Tracing, please refer to the xref:opentelemetry-tracing.adoc[OpenTelemetry Tracing Guide].
 ====
@@ -123,9 +124,13 @@ Here we are creating a counter for the number of invocations of the `hello()` me
 
 === Create the configuration
 
-There are no mandatory configurations for the extension to work.
+The only mandatory configuration for OpenTelemetry Metrics is the one enabling it:
+[source,properties]
+----
+quarkus.otel.metrics.enabled=true
+----
 
-If you need to change any of the default property values, here is an example on how to configure the default OTLP gRPC Exporter within the application, using the `src/main/resources/application.properties` file:
+To change any of the default property values, here is an example on how to configure the default OTLP gRPC Exporter within the application, using the `src/main/resources/application.properties` file:
 
 [source,properties]
 ----
@@ -174,6 +179,15 @@ The default is `cdi`.
 <2> Set the interval to export the metrics.
 The default is `1m`, which is too long for debugging.
 
+Also add this dependency to your project:
+[source,xml]
+----
+<dependency>
+    <groupId>io.opentelemetry</groupId>
+    <artifactId>opentelemetry-exporter-logging</artifactId>
+</dependency>
+----
+
 === Start the application
 
 Now we are ready to run our application.

docs/src/main/asciidoc/opentelemetry.adoc

@@ -63,6 +63,17 @@ For now only manual instrumentation is supported. You can use the OpenTelemetry
 
 In the future, we plan to bridge current Micrometer metrics to OpenTelemetry and maintain compatibility when possible.
 
+=== xref:opentelemetry-logging.adoc[OpenTelemetry Logging Guide]
+
+==== Enable Logs
+The logging functionality is experimental and *off* by default. You will need to activate it by setting:
+
+[source,properties]
+----
+quarkus.otel.logs.enabled=true
+----
+At build time on your `application.properties` file.
+
 == Using the extension
 
 If you already have your Quarkus project, you can add the `quarkus-opentelemetry` extension

extensions/opentelemetry/deployment/pom.xml

@@ -140,6 +140,21 @@
             <artifactId>quarkus-security-deployment</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>io.opentelemetry</groupId>
+            <artifactId>opentelemetry-sdk-testing</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jboss.slf4j</groupId>
+            <artifactId>slf4j-jboss-logmanager</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jboss.logmanager</groupId>
+            <artifactId>log4j2-jboss-logmanager</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

extensions/opentelemetry/deployment/src/main/java/io/quarkus/opentelemetry/deployment/OpenTelemetryProcessor.java

@@ -23,14 +23,15 @@
 import org.jboss.jandex.Type;
 
 import io.opentelemetry.api.OpenTelemetry;
-import io.opentelemetry.api.trace.SpanKind;
+import io.opentelemetry.exporter.otlp.internal.OtlpLogRecordExporterProvider;
 import io.opentelemetry.exporter.otlp.internal.OtlpMetricExporterProvider;
 import io.opentelemetry.exporter.otlp.internal.OtlpSpanExporterProvider;
 import io.opentelemetry.instrumentation.annotations.AddingSpanAttributes;
 import io.opentelemetry.instrumentation.annotations.WithSpan;
 import io.opentelemetry.sdk.autoconfigure.spi.AutoConfigurationCustomizerProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigurablePropagatorProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.ResourceProvider;
+import io.opentelemetry.sdk.autoconfigure.spi.logs.ConfigurableLogRecordExporterProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.metrics.ConfigurableMetricExporterProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.traces.ConfigurableSamplerProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.traces.ConfigurableSpanExporterProvider;
@@ -86,7 +87,6 @@ public boolean test(AnnotationInstance annotationInstance) {
             return annotationInstance.name().equals(ADD_SPAN_ATTRIBUTES);
         }
     };
-    private static final DotName SPAN_KIND = DotName.createSimple(SpanKind.class.getName());
     private static final DotName WITH_SPAN_INTERCEPTOR = DotName.createSimple(WithSpanInterceptor.class.getName());
     private static final DotName ADD_SPAN_ATTRIBUTES_INTERCEPTOR = DotName
             .createSimple(AddingSpanAttributesInterceptor.class.getName());
@@ -163,10 +163,31 @@ void handleServices(OTelBuildConfig config,
                     Set.of("META-INF/services/io.opentelemetry.sdk.autoconfigure.spi.metrics.ConfigurableMetricExporterProvider")));
         }
 
+        final List<String> logRecordExporterProviders = ServiceUtil.classNamesNamedIn(
+                Thread.currentThread().getContextClassLoader(),
+                SPI_ROOT + ConfigurableLogRecordExporterProvider.class.getName())
+                .stream()
+                .filter(p -> !OtlpLogRecordExporterProvider.class.getName().equals(p))
+                .collect(toList()); // filter out OtlpLogRecordExporterProvider since it depends on OkHttp
+        if (!logRecordExporterProviders.isEmpty()) {
+            services.produce(
+                    new ServiceProviderBuildItem(ConfigurableLogRecordExporterProvider.class.getName(),
+                            logRecordExporterProviders));
+        }
+        if (config.logs().exporter().stream().noneMatch(ExporterType.Constants.OTLP_VALUE::equals)) {
+            removedResources.produce(new RemovedResourceBuildItem(
+                    ArtifactKey.fromString("io.opentelemetry:opentelemetry-exporter-otlp"),
+                    Set.of("META-INF/services/io.opentelemetry.sdk.autoconfigure.spi.logs.ConfigurableLogRecordExporterProvider")));
+        }
+
         runtimeReinitialized.produce(
                 new RuntimeReinitializedClassBuildItem("io.opentelemetry.sdk.autoconfigure.TracerProviderConfiguration"));
         runtimeReinitialized.produce(
                 new RuntimeReinitializedClassBuildItem("io.opentelemetry.sdk.autoconfigure.MeterProviderConfiguration"));
+        runtimeReinitialized.produce(
+                new RuntimeReinitializedClassBuildItem("io.opentelemetry.sdk.autoconfigure.LoggerProviderConfiguration"));
+        runtimeReinitialized.produce(
+                new RuntimeReinitializedClassBuildItem("io.quarkus.opentelemetry.runtime.logs.OpenTelemetryLogHandler"));
 
         services.produce(ServiceProviderBuildItem.allProvidersFromClassPath(
                 ConfigurableSamplerProvider.class.getName()));