Add annotation and cofiguration for disabling tracing

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

@@ -589,6 +589,81 @@ quarkus.otel.instrument.rest=false
 quarkus.otel.instrument.resteasy=false
 ----
 
+=== Disable specific REST endpoints
+
+There are two ways to disable tracing for a specific REST endpoint.
+
+You can use the `@io.quarkus.opentelemetry.runtime.tracing.Traceless` (or simply `@Traceless`) annotation to disable tracing for a specific endpoint.
+
+Examples:
+
+==== `@Traceless` annotation on a class
+
+[source,java]
+.PingResource.java
+----
+@Path("/health")
+public class PingResource {
+
+    @Path("/ping")
+    public String ping() {
+        return "pong";
+    }
+}
+----
+
+When the `@Traceless` annotation is placed on a class, all methods annotated with `@Path` will be excluded from tracing.
+
+==== `@Traceless` annotation on a method
+
+[source,java]
+.TraceResource.java
+----
+@Path("/trace")
+@Traceless
+public class TraceResource {
+
+    @Path("/no")
+    @GET
+    @Traceless
+    public String noTrace() {
+        return "no";
+    }
+
+    @Path("/yes")
+    @GET
+    public String withTrace() {
+        return "yes";
+    }
+}
+----
+
+In the example above, only `GET /trace/yes` will be included in tracing.
+
+==== Disable using configuration
+
+If you do not want to modify the source code, you can use your `application.properties` to disable a specific endpoint through the `quarkus.otel.traces.suppress-application-uris` property.
+
+Example:
+
+[source,properties]
+.application.properties
+----
+quarkus.otel.traces.suppress-application-uris=trace,ping,people*
+----
+
+This configuration will:
+
+- Disable tracing for the `/trace` URI;
+- Disable tracing for the `/ping` URI;
+- Disable tracing for the `/people` URI and all other URIs under it, e.g., `/people/1`, `/people/1/cars`.
+
+[NOTE]
+====
+If you are using `quarkus.http.root-path`, you need to remember to include the root path in the configuration. Unlike `@Traceless`, this configuration does not automatically add the root path.
+====
+
+
 [[configuration-reference]]
 == OpenTelemetry Configuration Reference
 

extensions/opentelemetry/deployment/src/main/java/io/quarkus/opentelemetry/deployment/tracing/DropApplicationUrisBuildItem.java

@@ -0,0 +1,19 @@
+package io.quarkus.opentelemetry.deployment.tracing;
+
+import io.quarkus.builder.item.MultiBuildItem;
+
+/**
+ * Represents an application uri that must be ignored for tracing.
+ */
+public final class DropApplicationUrisBuildItem extends MultiBuildItem {
+
+    private final String uri;
+
+    public DropApplicationUrisBuildItem(String uri) {
+        this.uri = uri;
+    }
+
+    public String uri() {
+        return uri;
+    }
+}

extensions/opentelemetry/deployment/src/main/java/io/quarkus/opentelemetry/deployment/tracing/TracerProcessor.java

@@ -10,15 +10,18 @@
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.BooleanSupplier;
 
 import jakarta.enterprise.inject.spi.EventContext;
 import jakarta.inject.Singleton;
 
+import org.eclipse.microprofile.config.ConfigProvider;
 import org.jboss.jandex.AnnotationInstance;
 import org.jboss.jandex.AnnotationTarget;
+import org.jboss.jandex.ClassInfo;
 import org.jboss.jandex.DotName;
 import org.jboss.jandex.FieldInfo;
 import org.jboss.jandex.IndexView;
@@ -53,6 +56,7 @@
 import io.quarkus.opentelemetry.runtime.config.build.OTelBuildConfig;
 import io.quarkus.opentelemetry.runtime.config.build.OTelBuildConfig.SecurityEvents.SecurityEventType;
 import io.quarkus.opentelemetry.runtime.tracing.DelayedAttributes;
+import io.quarkus.opentelemetry.runtime.tracing.Traceless;
 import io.quarkus.opentelemetry.runtime.tracing.TracerRecorder;
 import io.quarkus.opentelemetry.runtime.tracing.cdi.TracerProducer;
 import io.quarkus.opentelemetry.runtime.tracing.security.EndUserSpanProcessor;
@@ -69,6 +73,8 @@ public class TracerProcessor {
     private static final DotName SPAN_EXPORTER = DotName.createSimple(SpanExporter.class.getName());
     private static final DotName SPAN_PROCESSOR = DotName.createSimple(SpanProcessor.class.getName());
     private static final DotName TEXT_MAP_PROPAGATOR = DotName.createSimple(TextMapPropagator.class.getName());
+    private static final DotName TRACELESS = DotName.createSimple(Traceless.class.getName());
+    private static final DotName PATH = DotName.createSimple("jakarta.ws.rs.Path");
 
     @BuildStep
     UnremovableBeanBuildItem ensureProducersAreRetained(
@@ -131,15 +137,31 @@ UnremovableBeanBuildItem ensureProducersAreRetained(
         return new UnremovableBeanBuildItem(new UnremovableBeanBuildItem.BeanClassNamesExclusion(retainProducers));
     }
 
+    @BuildStep
+    void dropApplicationUris(
+            CombinedIndexBuildItem combinedIndexBuildItem,
+            BuildProducer<DropApplicationUrisBuildItem> uris) {
+        String rootPath = ConfigProvider.getConfig().getOptionalValue("quarkus.http.root-path", String.class).orElse("/");
+        IndexView index = combinedIndexBuildItem.getIndex();
+        Collection<AnnotationInstance> annotations = index.getAnnotations(TRACELESS);
+        Set<String> tracelessUris = generateTracelessUris(annotations.stream().toList(), rootPath);
+        for (String uri : tracelessUris) {
+            uris.produce(new DropApplicationUrisBuildItem(uri));
+        }
+    }
+
     @BuildStep
     void dropNames(
             Optional<FrameworkEndpointsBuildItem> frameworkEndpoints,
             Optional<StaticResourcesBuildItem> staticResources,
             BuildProducer<DropNonApplicationUrisBuildItem> dropNonApplicationUris,
-            BuildProducer<DropStaticResourcesBuildItem> dropStaticResources) {
+            BuildProducer<DropStaticResourcesBuildItem> dropStaticResources,
+            List<DropApplicationUrisBuildItem> applicationUris) {
+
+        List<String> nonApplicationUris = new ArrayList<>(
+                applicationUris.stream().map(DropApplicationUrisBuildItem::uri).toList());
 
         // Drop framework paths
-        List<String> nonApplicationUris = new ArrayList<>();
         frameworkEndpoints.ifPresent(
                 frameworkEndpointsBuildItem -> {
                     for (String endpoint : frameworkEndpointsBuildItem.getEndpoints()) {
@@ -170,6 +192,67 @@ void dropNames(
         dropStaticResources.produce(new DropStaticResourcesBuildItem(resources));
     }
 
+    private Set<String> generateTracelessUris(final List<AnnotationInstance> annotations, final String rootPath) {
+        final Set<String> applicationUris = new HashSet<>();
+        for (AnnotationInstance annotation : annotations) {
+            AnnotationTarget.Kind kind = annotation.target().kind();
+
+            switch (kind) {
+                case CLASS -> {
+                    AnnotationInstance classAnnotated = annotation.target().asClass().annotations()
+                            .stream().filter(TracerProcessor::isClassAnnotatedWithPath).findFirst().orElse(null);
+
+                    if (Objects.isNull(classAnnotated)) {
+                        continue;
+                    }
+
+                    String classPath = classAnnotated.value().asString();
+                    String finalPath = combinePaths(rootPath, classPath);
+
+                    if (containsPathExpression(finalPath)) {
+                        applicationUris.add(sanitizeForTraceless(finalPath) + "*");
+                        continue;
+                    }
+
+                    applicationUris.add(finalPath + "*");
+                    applicationUris.add(finalPath);
+                }
+                case METHOD -> {
+                    ClassInfo classInfo = annotation.target().asMethod().declaringClass();
+
+                    AnnotationInstance possibleClassAnnotatedWithPath = classInfo.asClass()
+                            .annotations()
+                            .stream()
+                            .filter(TracerProcessor::isClassAnnotatedWithPath)
+                            .findFirst()
+                            .orElse(null);
+
+                    if (Objects.isNull(possibleClassAnnotatedWithPath)) {
+                        continue;
+                    }
+
+                    String finalPath;
+                    String classPath = possibleClassAnnotatedWithPath.value().asString();
+                    AnnotationInstance possibleMethodAnnotatedWithPath = annotation.target().annotation(PATH);
+                    if (possibleMethodAnnotatedWithPath != null) {
+                        String methodValue = possibleMethodAnnotatedWithPath.value().asString();
+                        finalPath = combinePaths(rootPath, combinePaths(classPath, methodValue));
+                    } else {
+                        finalPath = combinePaths(rootPath, classPath);
+                    }
+
+                    if (containsPathExpression(finalPath)) {
+                        applicationUris.add(sanitizeForTraceless(finalPath) + "*");
+                        continue;
+                    }
+
+                    applicationUris.add(finalPath);
+                }
+            }
+        }
+        return applicationUris;
+    }
+
     @BuildStep
     @Record(ExecutionTime.STATIC_INIT)
     SyntheticBeanBuildItem setupDelayedAttribute(TracerRecorder recorder, ApplicationInfoBuildItem appInfo) {
@@ -256,6 +339,37 @@ private static ObserverConfiguratorBuildItem createEventObserver(
                 }));
     }
 
+    private static boolean containsPathExpression(String value) {
+        return value.indexOf('{') != -1;
+    }
+
+    private static String sanitizeForTraceless(final String path) {
+        int braceIndex = path.indexOf('{');
+        if (braceIndex == -1) {
+            return path;
+        }
+        if (braceIndex > 0 && path.charAt(braceIndex - 1) == '/') {
+            return path.substring(0, braceIndex - 1);
+        } else {
+            return path.substring(0, braceIndex);
+        }
+    }
+
+    private static boolean isClassAnnotatedWithPath(AnnotationInstance annotation) {
+        return annotation.target().kind().equals(AnnotationTarget.Kind.CLASS) &&
+                annotation.name().equals(PATH);
+    }
+
+    private String combinePaths(String basePath, String relativePath) {
+        if (!basePath.endsWith("/")) {
+            basePath += "/";
+        }
+        if (relativePath.startsWith("/")) {
+            relativePath = relativePath.substring(1);
+        }
+        return basePath + relativePath;
+    }
+
     static final class SecurityEventsEnabled implements BooleanSupplier {
 
         private final boolean enabled;

extensions/opentelemetry/deployment/src/test/java/io/quarkus/opentelemetry/deployment/OpenTelemetrySuppressAppUrisTest.java

@@ -0,0 +1,87 @@
+package io.quarkus.opentelemetry.deployment;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.hamcrest.Matchers.is;
+
+import java.util.List;
+
+import jakarta.inject.Inject;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.StringAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.opentelemetry.sdk.trace.data.SpanData;
+import io.quarkus.opentelemetry.deployment.common.TracerRouter;
+import io.quarkus.opentelemetry.deployment.common.exporter.InMemoryExporter;
+import io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporterProvider;
+import io.quarkus.opentelemetry.deployment.common.traces.TraceMeResource;
+import io.quarkus.test.QuarkusUnitTest;
+import io.restassured.RestAssured;
+
+public class OpenTelemetrySuppressAppUrisTest {
+    @RegisterExtension
+    static final QuarkusUnitTest TEST = new QuarkusUnitTest().setArchiveProducer(
+            () -> ShrinkWrap.create(JavaArchive.class)
+                    .addPackage(InMemoryExporter.class.getPackage())
+                    .addAsResource("resource-config/application.properties", "application.properties")
+                    .addAsResource(
+                            "META-INF/services-config/io.opentelemetry.sdk.autoconfigure.spi.traces.ConfigurableSpanExporterProvider",
+                            "META-INF/services/io.opentelemetry.sdk.autoconfigure.spi.traces.ConfigurableSpanExporterProvider")
+                    .addAsResource(new StringAsset(InMemoryMetricExporterProvider.class.getCanonicalName()),
+                            "META-INF/services/io.opentelemetry.sdk.autoconfigure.spi.metrics.ConfigurableMetricExporterProvider")
+                    .addClasses(TracerRouter.class, TraceMeResource.class))
+            .overrideConfigKey("quarkus.otel.traces.suppress-application-uris", "tracer,/hello/Itachi");
+
+    @Inject
+    InMemoryExporter exporter;
+
+    @BeforeEach
+    void setup() {
+        exporter.reset();
+    }
+
+    @Test
+    @DisplayName("Should not trace when the using configuration quarkus.otel.traces.suppress-application-uris without slash")
+    void testingSuppressAppUrisWithoutSlash() {
+        RestAssured.when()
+                .get("/tracer").then()
+                .statusCode(200)
+                .body(is("Hello Tracer!"));
+
+        RestAssured.when()
+                .get("/trace-me").then()
+                .statusCode(200)
+                .body(is("trace-me"));
+
+        List<SpanData> spans = exporter.getSpanExporter().getFinishedSpanItems(1);
+
+        assertThat(spans)
+                .hasSize(1)
+                .satisfiesOnlyOnce(span -> assertThat(span.getName()).containsOnlyOnce("trace-me"));
+    }
+
+    @Test
+    @DisplayName("Should not trace when the using configuration quarkus.otel.traces.suppress-application-uris with slash")
+    void testingSuppressAppUrisWithSlash() {
+        RestAssured.when()
+                .get("/hello/Itachi").then()
+                .statusCode(200)
+                .body(is("Amaterasu!"));
+
+        RestAssured.when()
+                .get("/trace-me").then()
+                .statusCode(200)
+                .body(is("trace-me"));
+
+        List<SpanData> spans = exporter.getSpanExporter().getFinishedSpanItems(1);
+
+        assertThat(spans)
+                .hasSize(1)
+                .satisfiesOnlyOnce(span -> assertThat(span.getName()).containsOnlyOnce("trace-me"));
+    }
+}