How to Scale a Cloud Automatically

You have to pay for the cloud automatic. Unfortunately, it's not available by default, but you can turn it on at least. And then I use a metric math formula to calculate the number of on demand instances that I need that are missing in the spot and in the on demand pool. So this basically gives me how many on demand instances do I have to add if it's greater than zero or if it's lower than zero, how many instances I have to remove. That's kind of the diff in instances that we need. We want to improve that and add an on demand fall back to that pull off instances.