Proc/Sys/Fs
Fleeting- External reference: https://www.kernel.org/doc/html/latest/admin-guide/sysctl/fs.html#file-max-file-nr
file-max-file-nr
The three values in file-nr denote the number of allocated file handles, the number of allocated but unused file handles, and the maximum number of file handles
— https://www.kernel.org/doc/html/latest/admin-guide/sysctl/fs.html#file-max-file-nr