I have Ubuntu 16.04 lts. I used https://www.howtoforge.com/tutorial/server-monitoring-with-munin-and-monit-on-ubuntu-16-04-lts/2/ for install and configure Monit and Munin tools. All work well except last part - configuration in ISP. I added URL to working sites for Monit and Munit, credentials and after click options Show Monit/Show Munin I have white container like screen shows but in Chrome console I see that something works (datalogstatus.php with status 200 multiply).
i'd assume your currently using a self-signed certificate for munin and monit, if so, you're getting the blank screen because it can't display any messages asking if you want to trust the certificate. if you reconfigure it all to work using plain http, or replace the self-signed cert with a valid trusted certificate then it should display everything ok.
Yea, You have right man. I have self-signed, because it's virtual machine. I tried to test both before implement them on production, which has lets encrypt ssl, so there this feature should work.
For monit you can refer to this. Basically, the tutorial you refer to already covers munin with https by putting it under ISPC port 8080. So, if your ISPC already using LE, your munin should be secured with LE already.
