I’m tearing my hair out - I have no unpolled devices, yet I can’t get rid of the “Unpolled devices” message. My validate is perfectly fine and up to date, I use rrdcached and my pollers appear to be polling correctly.
Can only be apache php - that’s why SQL was still correct. That indeed were a stupid mistake, thanks much Chas.
For those who arrive here by means of Google, make sure your timezone is right in your ini files. Ubuntu, for instance:
/etc/php/7.2/apache2/php.ini
/etc/php/7.2/cli/php.ini
A php --ini will giv you a good idea where that file may be, change cli to apache2 and you can check there or for nginx.
Run ‘date’ from command line - should be right, if it isn’t, google it for your distro.
mysql can be checked as Chas says, but I think you have to try pretty hard to screw that up by changing my.sql or something.