I'm running on Google Cloud. I was looking at the costs and I noticed something weird - every week the daily cost of running machines is going down, and then on the 1st day of the month, it goes back up.
It's "jumping" between $1/day up to $2.5/day, so it's very significant.
This is a screenshot of the cost breakdown of running one machine with 2 vCPUs, 7.5 GB RAM in europe-west.
Why is it going up and down? Is there any way to keep it at $1/day?