Billing of my GCP instance goes down every week and increases at the start of every month. Why is this fluctauation?

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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.

Why exactly does this happen? I can see a significant difference in the pricing.
Oct 9 in GCP by Karan
• 6,670 points
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1 answer to this question.

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The prices don't change, but an increasing discount is applied when your instances run longer.

Google Compute offers a sustained use discount for running specific Compute Engine resources a significant portion of the billing month. The discounts come in a couple of tiers and start to apply after running first 25% of a month, then increase after running 50% and 75% of the month. 

See https://cloud.google.com/compute/docs/sustained-use-discounts

answered Oct 9 by Sirajul
• 40,990 points

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