Drop timetracker
The idea of TimeTracker was to dump significant events with timestamps into a log file when built in debug mode and with an env var set. Whilst the idea of TimeTracker was nice, it didn't deliver.
The output was custom JSON that was lacked any visualisation tool, and the tracking all property changes for Applet objects isn't a very useful for QML applets.
In my many years of having to profile plasma, this isn't a tool I ever see people reaching for.
You can achieve similar results by setting a QT_MESSAGE_PATTERN with timestamps. If some wanted to build something better, we would be better starting anew with ftrace.