/etc/xdg/messagelib.categories is in kf5-messagelib-data 4:16.04.3-3~deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # messagelib
log_messagecomposer messagelib (messagecomposer)
log_messagecore messagelib (messagecore)
log_messagelist messagelib (messagelist)
log_messageviewer messagelib (messageviewer)
log_templateparser messagelib (templateparser)
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