Hi there!
Just installed DietPI-Dashboard and start loving it.
As my system was recently upgraded, I wonder if Dashboard give any alert about pending upgrades, more or less the way Webmin does.
I have not found any information about that but is so complete application that I think surely it has the option.
Pending apt package updates are shown under “management” section.
I’m not sure right now, but it could be that as soon as a DietPi update is available, no more apt package updates will be shown. Because the DietPi update would automatically update all available apt packages.