i have enabled this by add the -l Parameter. Shutdown all LXC's, edit /lib/systemd/system/lxcfs.service, restart lxcfs and startup the containers again. Seems to work but i have lots of messages in syslog:
Apr 20 10:47:42 proxmox lxcfs[20932]: bindings.c: 5478: refresh_load: Open proc_path failed in refresh_load.
Edit:
I think i found the Problem.
After looking at the bindings.c code i sea that every 5 seconds the values where reloaded in proc.
I have multiple lxc containers with screen sessions. In screnn hardline i display some useful infos, also loadavg
and i reread loadavg every 5 seconds 
I changed this to 7 seconds and the syslog message is gone.
Apr 20 10:47:42 proxmox lxcfs[20932]: bindings.c: 5478: refresh_load: Open proc_path failed in refresh_load.
Edit:
I think i found the Problem.
After looking at the bindings.c code i sea that every 5 seconds the values where reloaded in proc.
I have multiple lxc containers with screen sessions. In screnn hardline i display some useful infos, also loadavg


I changed this to 7 seconds and the syslog message is gone.
Last edited: