Individuals using betas are free to use the Feedback Assistant; Devs can use the 'Report Bugs' link, below right. 8.2018
Edit 12.15.19 - For those that haven't yet been made aware, the bug reporter link below now goes straight to the FA, so...
Stay tuned for a 2021 update to see if the FA lives, or if Apple, in their continuing quest to find things to change yet again, retires the FA and restores 'bug reporter'.
Meanwhile, after the launch of macOS 10.15 (Catalina), the 'Report Bugs" links at the bottom of the Apple Developer Forum also refers to the Feedback Assistant.