The first bugfix update for version 8.0 is already available!
It has a fix for regression in the Powershell runner (TW-29803), a few performance improvements in the Git agent side checkout when SSH is used (TW-14598), fixes in custom charts (TW-29792), and a number of other important fixes.
Download the fix now and refer to the Release notes for the full list of resolved issues and improvements.
Happy building!
The TeamCity Team