Enable debug logging

Enable verbose logs for Rider

• First of all, set env variable system wide: GITHUB_COPILOT_DEBUG="true"
• Navigate to Help | Edit Custom Properties
• Add a line idea.log.trace.categories=#com.github.copilot
  • 
• Restart Rider

Enable verbose log for non-Rider IDEs

Debug logs can be enabled in the following way:

• First of all, set env variable system wide: GITHUB_COPILOT_DEBUG="true"
• Navigate to Help | Diagnostic Tools | Debug Log Settings...
  • 
• Add log level instructions for Copilot, for example: com.github.copilot:trace
  • 

Log file

Reproduce the issue and collect idea.log (Help | Show Log in Finder/Explorer or Help | Collect Logs and Diagnostic Data)

Note, there might also be idea.1.log, idea.2.log ... when logs are too long and get rotated. It's recommended to zip them all.

Logging levels

• debug (correlates to fine)
• trace (correlates to finer)
• all (all messages are logged, so it is a logging level of maximal granularity)

More

From JetBrains.