Please extend net.if metrics and net.if.discovery on Linux using sysfs net

https://www.kernel.org/doc/Documentation/filesystems/sysfs.txt

At least the following macros should be added into net.if.discovery in addition to {#IFNAME}:
{#IFOPERSTATUS}
{#IFALIAS}
{#IFTYPE}
 
At least metrics such as:
"speed", "duplex", "type", "ifalias", "operstate", "carrier" as well as probably many others, must be added and should be accessible under net.if.* metrics branch. 
Lists should be finalized in the spec.