Hi. I have a project that has been running for around half a year. It has practically 0 users, but I have been charged anything ranging from $10-$20 for it monthly.

https://i.gyazo.com/70099eaea8f6bc149c3a5a09d392bd9c.png

This is my image service, and I've been charged $10 for it alone this month. But If I check the metrics then it uses same amount of resources that my backend does (for which I was charged about $1).

This is backend metrics:
https://i.gyazo.com/0c538a05f2edc4cf8d068c047684a634.png

Why is the difference so big? Am I missing something?