This sounds like a bug in the sysstats module, which is not a core part of Webmin - you should contact its author about this.
[bugs:#4367] Webminstats stops working if you delete old usr/libexec/webmin-1.nnnn directories
Created: Fri Jan 31, 2014 09:01 PM UTC by Richard Farthing
Last Updated: Fri Jan 31, 2014 09:01 PM UTC
When upgrading webmin, Webminstats links don't seem to get updated in /etc/webmin/sysstats (and all its subdirectories). So the symlinks all point to the older version of webmin e.g. sysstats-alarm-lib.pl points to usr/libexec/webmin-1.650/sysstats-alarm-lib.pl.
If you then delete the old usr/libexec/webmin-1.nnnn directory to free up disk space, sysstats stops working
This issue has been present for a few versions I think.
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