[Pdns-users] Graphing as a service: Disappearing CPU graphs

[sthaug at nethelp.no]

A small followup to this message from 23. January 2019:

> We use PowerDNS "Graphing as a service",
> 
> https://blog.powerdns.com/2014/12/11/powerdns-graphing-as-a-service/
> 
> for our pdns-recursor installations. Environment:
> 
> FreeBSD 11.2, PowerDNS Recursor 4.1.8, carbon-server=37.252.122.50.
> 
> This works well, with one minor but slightly irritating exception:
> 
> - The User CPU% and System CPU% graphs sometimes disappear, after
> days/weeks of uptime. The *space* for the graphs (with legends for
> User CPU% blue and System CPU% red, on the right hand side) is still
> present but the graphs themselves are not shown.

The problem turns out to be a bug in FreeBSD resulting in CPU time
overflow. Fixed in

https://svnweb.freebsd.org/base?view=revision&revision=344133

Thanks to Bert Hubert for help in resolving this!

Steinar Haug, AS2116