When necessary, you can raise GitHub issues against the Zowe™ zlux core repository here. It is suggested that you use either the bug or enhancement template.
Please provide as much of the information listed on Troubleshooting Zowe Application Framework as possible. Anyone working on the issue might need to request this and other information if it is not supplied initially. A description of the error and how it can be reproduced is the most important information.
Enhancement reports are just as important to the Zowe project as bug reports. Enhancement reports should be clear and detailed requirements for a potential enhancement.