Arbitrary limitation on Scheduler log, to prevent lock-ups when testing and debugging for a long duration, with additional logs. The string list appears in the interface, and can get difficult to handle for the UI. This would probably require a user setting.

Generate enough activity in the Scheduler to fill 2000 lines of text at the bottom of the screen.
Verify that for each added line after 2000, the last line disappears.
Verify that all lines are properly forwarded to the standard error or external debug log, depending on KStars/Ekos options.