I use monitorix

As non-root user, install monitorix

yaourt -S monitorix --noconfirm --needed

Log as root, enable the default buildt-in lightweight webserver and change the port

nano /etc/monitorix/monitorix.conf
----
title = Kiska Router
hostname = Kiska
....
<httpd_builtin>
        enabled = y
        host =
        port = 8113
....
<graph_enable>
....
        raspberrypi = y
....

Start the service and check the journal by issuing

systemctl start monitorix
systemctl status monitorix

If everythink looks good

systemctl enable monitorix

View the system stats via a webbrowser at IP:8113/monitorix. When running for the first time Monitroix, several minutes are necessary for the data collected to be displayed graphically.

Install anyting-sync-daemon to reduce read/write on the sd card

yaourt -S anything-sync-daemon --noconfirm

Configure anything-sync-daemon:

nano -w /etc/asd.conf
-----
WHATTOSYNC=('/var/lib/monitorix') 

Start the service and check the journal by issuing

systemctl start asd
systemctl status asd

If everythink looks good

systemctl enable asd