Early Bird Registration for DrupalCon Portland 2024 is open! Register by 23:59 UTC on 18 March 2024, to get $100 off your ticket.
Instead of porting ThemeKey Debug from 7.x to 8.x we should consider to provide a custom data collector for the Web Profiler module.
The new ThemeKey Debug should replace the themekey.engine service to collect the data if enabled.