Rest during sets

Just wanted to check, is it ok to rest during a set at the top position for a pushup or bottom position for a pullup/row or would that be considered breaking the tempo?

Of course it is breaking the tempo don't count it for mastery if you need to pause and catch your breath, and if you need to do this to hit your targets then you should not consider them hit. Repeat the target or microcycle as necessary until your work capacity is up to the challenge.

 

That said, it's a great plateau-breaker if you seem to keep failing at the same point, or to get to multiple reps when you only have singles.