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@BrickMan
Seen quite a few exotic square taper cranks crack across there, middleburn used to have a real problem with that happening.
I think careful use of a torque wrench helps, but sometimes they just fail with age.
I would save the chainrings for a rainy day, and put the other crank arm (if not cracked or insert hanging out) on ebay as someone will probably need it.
Pedal inserts CAN be glued back in, but you need some proper stud lock solution (about £8-10 a tube) and for the insert to be not damaged after you've got it off the pedal (very unlikely!).