as this overload is caused by regular requests (although those requests are coming sometimes in a big amount), there is nothing a control panel can detect about them.
The requests to xmlrpc.php are a quite common problem - and are not solved by deleting that file, as then the requests are redirected to the index.php and overloading your site again.
Here you will find a strategie how to protect yourself with a simple rule in the .htaccess of your WordPress installation:
For more information, you can start reading here:
Voorbeeld voor in uw htaccess:
# protect xmlrpc
Deny from all