There’s also the following KDE Discuss thread – <KRunner - QThreadStorage>
And, there’s also a related Bug Report: <KRunner does not appear QThreadStorage>
Looking at the Bug Report, it seems to be a Plasma 6 issue but, on this Plasma 5 system I’m seeing the following systemd user Journal entries –
Feb 05 16:10:15 digikam[5072]: QThreadStorage: Thread 0x555d6cd94c70 exited after QThreadStorage 15 destroyed
Feb 05 16:10:15 digikam[5072]: QThreadStorage: Thread 0x555d6cd94c70 exited after QThreadStorage 12 destroyed
Feb 05 16:10:15 digikam[5072]: QThreadStorage: Thread 0x555d6ce3f3f0 exited after QThreadStorage 15 destroyed
Feb 05 16:10:15 digikam[5072]: QThreadStorage: Thread 0x555d6ce3f3f0 exited after QThreadStorage 12 destroyed
Feb 05 16:10:15 digikam[5072]: QThreadStorage: Thread 0x555d70f18220 exited after QThreadStorage 15 destroyed
Feb 05 16:10:15 digikam[5072]: QThreadStorage: Thread 0x555d70f18220 exited after QThreadStorage 12 destroyed
Operating System: openSUSE Leap 15.6
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12
Kernel Version: 6.4.0-150600.23.33-default (64-bit)
Graphics Platform: X11
Processors: 8 × AMD Ryzen 5 3400G with Radeon Vega Graphics
Memory: 29.3 GiB of RAM
Graphics Processor: AMD Radeon Vega 11 Graphics
Manufacturer: ASUS
On this Qt5 system, only digiKam is throwing these messages.