I've only just installed the plugin, so can't say if this is a bug or expected, but I keep getting this on server load, so can't tell yet if it's actually checking for if any updates exitst..
(01:21:26) | [Update Notice] Failed to check for RUST updates, if this keeps happening please contact the developer.
Error Code: 429 | Message: <html>
<head>
<title>429 Too Many Requests</title>
</head>
<body>
<h1>Too Many Requests</h1>
</body>
</html>