fix: status_code as integer in metrics (#4)

Author: enicioli

src/Middleware/MetricMiddleware.php

@@ -36,12 +36,12 @@ public function process(ServerRequestInterface $request, RequestHandlerInterface
         try {
             $response = $handler->handle($request);
 
-            $attributes[HttpAttributes::HTTP_RESPONSE_STATUS_CODE] = (string) $response->getStatusCode();
+            $attributes[HttpAttributes::HTTP_RESPONSE_STATUS_CODE] = $response->getStatusCode();
 
             return $response;
         } catch (Throwable $exception) {
             $attributes[ErrorAttributes::ERROR_TYPE] = get_class($exception);
-            $attributes[HttpAttributes::HTTP_RESPONSE_STATUS_CODE] = '500';
+            $attributes[HttpAttributes::HTTP_RESPONSE_STATUS_CODE] = 500;
 
             throw $exception;
         } finally {

tests/Unit/Middleware/MetricMiddlewareTest.php

@@ -83,7 +83,7 @@ public function testProcessWithSuccessfulRequest(): void
         $expectedAttributes = [
             HttpAttributes::HTTP_ROUTE => '/users/{number}',
             HttpAttributes::HTTP_REQUEST_METHOD => 'GET',
-            HttpAttributes::HTTP_RESPONSE_STATUS_CODE => '200',
+            HttpAttributes::HTTP_RESPONSE_STATUS_CODE => 200,
         ];
 
         $this->histogram->expects($this->once())
@@ -169,7 +169,7 @@ public function testProcessWithException(): void
                     HttpAttributes::HTTP_ROUTE => $path,
                     HttpAttributes::HTTP_REQUEST_METHOD => $method,
                     ErrorAttributes::ERROR_TYPE => RuntimeException::class,
-                    HttpAttributes::HTTP_RESPONSE_STATUS_CODE => '500',
+                    HttpAttributes::HTTP_RESPONSE_STATUS_CODE => 500,
                 ]
             );
 

tests/Unit/Middleware/TraceMiddlewareTest.php

@@ -159,7 +159,7 @@ public function testProcessWithSuccessfulRequest(): void
         $spanScope->expects($this->once())
             ->method('setAttributes')
             ->with([
-                HttpAttributes::HTTP_RESPONSE_STATUS_CODE => '200',
+                HttpAttributes::HTTP_RESPONSE_STATUS_CODE => 200,
                 HttpIncubatingAttributes::HTTP_RESPONSE_BODY_SIZE => '1024',
                 'http.response.header.content-type' => 'application/json',
                 'http.response.header.content-length' => '1024',

tests/Unit/Support/SpanScopeTest.php

@@ -96,7 +96,7 @@ public function testSetAttributes(): void
 
         $spanScope = new SpanScope($spanMock, $scopeMock, $contextMock);
 
-        $attributes = [HttpAttributes::HTTP_RESPONSE_STATUS_CODE => '200'];
+        $attributes = [HttpAttributes::HTTP_RESPONSE_STATUS_CODE => 200];
 
         $spanMock->expects($this->once())->method('setAttributes')->with($attributes)->willReturnSelf();