RRD Data removed after reboot with RAMdisk for /var /tmp

[eugenmayer]

We are currently invstigating a crash of opnsense every single week on Sat between 3-6 am.

While doing so, we looked at the health data. While traffic-health report is available for all 3 years, the system metrics are not.

In fact, after a normal reboot of the box, all system rrd data is lost, the last data available then is older then Aug 2018 - so it seem to have worked back in the days but since then every reboot of the box deletes the system rrd data - while traffic / packets are still there.

I double checked that the 2 checkboxes to

 /var RAM disk    Use memory file system for /var
 /tmp RAM disk    Use memory file system for /tmp

are not checked - so i have no RAM disk for rrd data.

Any idea how this happens? Interesting fact is, that Aug 06 2018 was the release date auf 18.7 - and i most probably instantly upgraded. So that upgrade could have caused this ( https://opnsense.org/opnsense-18-7-released/ ) ..

I am currently on 19.1.2, cannot go higher due to the LDAP bugs introduced in 19.1.3+

Thanks for any hints