i have just updated my Linksys WRT3200ACM to 21.02.0. Lost my config so i had to configure my device from scratch.
Anyway... on 19.07.8 everything was fine but on 21.02.0 when try to configure sensors plugin via in luci-statistics section i get " NotFoundError Executable not found" error.
It has been a bit annoying for the last few years that LuCI menu config dialog options needs slightly different thing that is needed for the underlying collectd itself.
As I expect that the issue may surface also for other along the 21.02 release bump, I fixed it permanently by expanding the collectd dependencies with