Proc/uptime doesn't exist?

Question

linux

Guys. I used to have a script that monitored the server.
I decided to take a more powerful server, but on the other hand, not a single monitoring tool monitors, or rather partially does not monitor.
Previously, there was a script like this https://github.com/lfiore/status/ simple, everything worked fine, as everything moved, it does not show anything.
Decided to try https://github.com/phpsysinfo/phpsysinfo. Does not show uptime and similar

Errors writes for example on uptime
file_exists(/proc/uptime)
the file does not exist on your machine
./xml.php on line 63
./includes/output/class.WebpageXML.inc.php on line 139 in function run()
./includes/xml/class.XML.inc.php on line 645 in function getXml()
./includes/xml/class.XML.inc.php on line 624 in function _buildXml()
./includes/os/class.OS.inc.php on line 144 in function getSys()
./includes/os/class. Linux.inc.php on line 1411 in function build()
./includes/os/class.Linux.inc.php on line 168 in function _uptime()
./includes/class.CommonFunctions.inc.php on line 332 in function rfts( "/proc/uptime", NULL, 1 )
The file itself exists, but weighs 0 bytes
And the rights are set to 0777.
It doesn't want to work and that's it ((
What to do, do not tell me?