High EFS EUC1-ETDataAccess-Bytes read costs but I can't see these reads on Cloudwatch

Question

Hi there,

we see drastically increased EFS daily costs in one account. It increased from one day to the other  (07.12.) from ~10$ per day to ~90$ per day (till today).
If I further observe it, I can see that it's EUC1-ETDataAccess-Bytes - and the reads (found via Cost Explorer with this service as filter, grouped by api operation).
What I absolutely cannot see is increased reads in this EFS filesystem via Cloudwatch... not at all.
This filesystem has ~20GB in total size and we are talking about 1.8TB reads per day that get billed! There must be any metric I could check... but there isn't - in fact everything dropped!
TotalIOBytes, DataReadIOBytes,MeteredIOBytes,MetaDataIOBytes .. everything dropped since 07.12.

Can somebody point me to things I could check?

Thx!

Answer

Hello,

Apologies for any frustration caused!

I recommend reaching out to our Billing & Accounts team who can help sort this out with you. 
They'll be the best suited to assist, as they have further visibility into cost related issues: go.aws/support-center.

— Elle G.

High EFS EUC1-ETDataAccess-Bytes read costs but I can't see these reads on Cloudwatch

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