I’m using gitea 1.10.3 with Google Chrome. I created several repositories and also imported some repositories from SVN (different user name). Not sure if this import is related I just noticed after several days that my heatmap disappeared. It is not displayed under Dashboard, nor Public Activity.
How can I enable it?
Thanks, Abyss
Are you using AdGuard? When yes, than disalbe it for Gitea.
I disabled all extensions, however it was still reproducible. Then I noticed that it works using MS Edge. Does not work via Firefox (other computer). The key point was that only MS Edge was at full screen, my browser was at half screen and the Firefox was on smaller screen. Apparently the heatmap is not displayed on smaller screen.
So it was my fault - sorry for that. Thanks for the help 
Abyss