What are the units tracking resource usage for the S0 Azure SQL Database?

This is in regards Azure accounts on the 12 months trial that come with free services.

The free services include a SQL Server Database using the DTU model in tier S0. The exact terms are stated here: azure.microsoft.com/en-us/free/free-account-faq/

When it comes down to the actual tracking in the Azure Portal, the blade at subscription/overview shows some indicators but the units are confusing / missing.

I had no luck finding a clear response online on what this metric could mean. It seems to me the metric was recently changed.

> What is the metric “2.54/31 (1/Day)” measuring exactly?

Images below showing specific case with current usage.

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