I believe you asked about this in July.
Some on the data is from engine db, which means its what is happening now - The first row.
There is caching so it may take a few minutes to refresh or by manual refresh.
Other widgets are based on the aggregated data stored in ovirt_engine_history db (DWH).
The DWH widgets are based on the last 24 hours of hourly aggregates.
The over time chart under the pie chart should show you the average consumption over time.
Please let me know or open a bug if you think there is an issue with the current behavior.
By clicking on the widgets you can also get a breakdown for hosts and vms.
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