The .travis.yml for each branch should be a good indicator of compatibility in general.File not found · NodeBB/NodeBB
Node.js based forum software built for the modern web - File not found · NodeBB/NodeBBfavicon
This is because probably you're in ddos attack, kindly opt for good ddos protection or use nginx and configure and block those ddos.
This can't really be the issue. It has to be some process spinning trying to do some action for the dashboard.