Even if there’s low chance, still asking it: is there any way we could have access to the server ?
Such symptoms seems to be environment related, and as such highly difficult to reproduce and fix.
Else, maybe check any limitation per-user, like cgroups, ulimits, etc… ? freeipmi & megacli both require privileges to read /dev/ipmi/0 and /dev/sd*
Maybe we can do a strace of the netdata daemon in the systemd service, but as both plugins require caps or setuid to work, if i reember well, tracing will cause them to lose these privileges, hence fail to work. Maybe we can also try running netdata as root (changing the systemd unit & netdata config)
[Service]
ExecStart=
ExecStart=/usr/bin/strace -fyytt -s 1024 -o /tmp/netdata.strace /home/netdata/usr/sbin/netdata -P /run/netdata/netdata.pid -D
Note: the empty ExecStart is required before.