fixes that

src/Handler/CloudWatch.php

@@ -295,6 +295,17 @@ class CloudWatch extends AbstractProcessingHandler
 
         $this->checkThrottle();
 
+        /**
+         * @var int $key
+         * @var LogRecord $logEvent
+         */
+        foreach ($data['logEvents'] as $key => $logEvent) {
+            $data['logEvents'][$key] = [
+                'message' => $logEvent->message,
+                'timestamp' => $logEvent->datetime->getTimestamp()
+            ];
+        }
+
         $response = $this->client->putLogEvents($data);
 
         $this->sequenceToken = $response->get('nextSequenceToken');