Third party AWS capacity outages monitoring?

Hey folks.

I setup a solution that needs one g6.xlarge intermittently and assumed that a capacity outage longer than a few hours was unlikely but we just had a 48h+ one in my region. Now I'm wondering about the frequency and length of similar capacity outages to help us plan our solution but I'm not finding much. I asked our corporate contact but of course AWS doesn't publish this info. I have to explain now to important people at my big org that AWS doesn't think we're special.

Are there any third party websites that monitor AWS on-demand capacity outages? Looking around I'm not easily finding anything.

I'm aware of reserved instances and other ideas to consider but this post is about on-demand capacity stats.

It seems to me like it should be an obvious and simple service to setup: try to start an EC2 periodically then shut it down. Wait awhile and try again. Monitor if a capacity limit was reached. You could cover dozens of combinations of EC2s in regions but only pay to have them running a few minutes each day. Publish statistics on it. Am I missing something? Surely third parties are doing this?

Thanks.