Pass the RFC 3164 severity level thru to drupal watchdog.

CRM/Core/Error.php

@@ -617,7 +617,7 @@ class CRM_Core_Error extends PEAR_ErrorStack {
     if (!empty(\Civi::$statics[__CLASS__]['userFrameworkLogging'])) {
       // should call $config->userSystem->logger($message) here - but I got a situation where userSystem was not an object - not sure why
       if ($config->userSystem->is_drupal and function_exists('watchdog')) {
-        watchdog('civicrm', '%message', ['%message' => $message], WATCHDOG_DEBUG);
+        watchdog('civicrm', '%message', ['%message' => $message], isset($priority) ? $priority : WATCHDOG_DEBUG);
       }
     }