That's a normal warning towards the end of the month if you're using the max allowable under the free tier. You have a 20GB disk that will, by definition, use 20 GB-Mo of storage allowance in 1 month, which is exactly what's allowed under free tier. At the start of the month you will have used 0 GB-Mo, and you use a bit each day. 85% of the way through the month you will have used 85% of 20 GB-Mo so the warning gets triggered.
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