to answer my own question: I have made a plugin that notifies the admin about all new questions, answers or comments with links inside or all edited questions, answers or comments with links inside.
Hint #1: You have to enable the event-logger plugin "Log events to qa_eventlog database table".
Hint #2: This is my first plugin and I am pretty new to PHP. It would be cool if someone could review/edit the code.
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April 20, 2021: Q2A 1.8.6 released!