feat: Record handled exceptions (#280)

This change records exceptions even if they are handled by the Kernel.
This is handy for apps that have an error handler registered.

src/SymfonyInstrumentation.php

@@ -141,5 +141,29 @@ public static function register(): void
                 $span->end();
             }
         );
+
+        hook(
+            HttpKernel::class,
+            'handleThrowable',
+            pre: static function (
+                HttpKernel $kernel,
+                array $params,
+                string $class,
+                string $function,
+                ?string $filename,
+                ?int $lineno,
+            ): array {
+                /** @var \Throwable $throwable */
+                $throwable = $params[0];
+
+                Span::getCurrent()
+                    ->recordException($throwable, [
+                        TraceAttributes::EXCEPTION_ESCAPED => true,
+                    ])
+                    ->setStatus(StatusCode::STATUS_ERROR, $throwable->getMessage());
+
+                return $params;
+            },
+        );
     }
 }

tests/Integration/SymfonyInstrumentationTest.php

@@ -5,6 +5,7 @@
 namespace OpenTelemetry\Tests\Instrumentation\Symfony\tests\Integration;
 
 use OpenTelemetry\API\Trace\SpanKind;
+use OpenTelemetry\API\Trace\StatusCode;
 use OpenTelemetry\Contrib\Propagation\ServerTiming\ServerTimingPropagator;
 use OpenTelemetry\Contrib\Propagation\TraceResponse\TraceResponsePropagator;
 use OpenTelemetry\SDK\Trace\ImmutableSpan;
@@ -18,6 +19,7 @@
 use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
+use Symfony\Component\HttpKernel\Exception\HttpException;
 use Symfony\Component\HttpKernel\HttpKernel;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 
@@ -40,6 +42,28 @@ public function test_http_kernel_handle_exception(): void
         );
     }
 
+    public function test_http_kernel_marks_root_as_erroneous(): void
+    {
+        $this->expectException(HttpException::class);
+        $kernel = $this->getHttpKernel(new EventDispatcher(), function () {
+            throw new HttpException(500, 'foo');
+        });
+        $this->assertCount(0, $this->storage);
+
+        $response = $kernel->handle(new Request(), HttpKernelInterface::MAIN_REQUEST, true);
+
+        $this->assertCount(1, $this->storage);
+        $this->assertSame(500, $this->storage[0]->getAttributes()->get(TraceAttributes::HTTP_RESPONSE_STATUS_CODE));
+
+        $this->assertSame(StatusCode::STATUS_ERROR, $this->storage[0]->getStatus()->getCode());
+
+        $this->assertArrayHasKey(
+            TraceResponsePropagator::TRACERESPONSE,
+            $response->headers->all(),
+            'traceresponse header is present if TraceResponsePropagator is present'
+        );
+    }
+
     public function test_http_kernel_handle_attributes(): void
     {
         $kernel = $this->getHttpKernel(new EventDispatcher());