collectd-mod-openvpn - Luci stats fail to display openvpn stats

[ezplanet]

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Steps to reproduce:

Configure openwrt with luci stats + openvpn plugin configure the openvpn plugin to point to the openvpn server status file as follows:

config statistics 'collectd_openvpn'
    option enable '1'
    option CollectIndividualUsers '1'
    option CollectCompression '1'
    option ImprovedNamingSchema '1'
    list StatusFile '/var/log/myvpnserver.status'

The following files are collected in the openvpn-myvpnserver.status folder under /var/rrd/myhostname

-rw-r--r--    1 root     root         25008 Apr 24 11:52 if_octets-UNDEF.rrd
-rw-r--r--    1 root     root         25008 Apr 27 14:37 if_octets-client1.rrd
-rw-r--r--    1 root     root         25008 Apr 28 14:06 if_octets-client2.rrd

Thare are files for each client that connected to the openvpn server running on the openwrt router (names are redacted). However going to the page: luci -> statistics -> graphs, OpenVPN tab

Broken images are displayed. This issue has been reported several times in OpenWRT forums, but it appears it was never addressed. Please see: [(https://forum.openwrt.org/t/collectd-mod-openvpn/11034/11)]

Actual behavior:

Broken images are displayed for OpenVPN in Luci stats graphs

Expected behavior:

graphs stats are expected

Additional Information:

OpenWrt version information from system /etc/openwrt_release:

DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='22.03-SNAPSHOT'
DISTRIB_REVISION='r20130-31b1366bc6'
DISTRIB_TARGET='mvebu/cortexa9'
DISTRIB_ARCH='arm_cortex-a9_vfpv3-d16'
DISTRIB_DESCRIPTION='OpenWrt 22.03-SNAPSHOT r20130-31b1366bc6'
DISTRIB_TAINTS='no-all'

It happened on every release since the plugin was included in luci stats.