Reservation Used Bytes parameter keeps changing

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I created a dashboard in the Cloud Monitoring to monitor BI Engine metrics. I have a chart to measure the Reservation Used Bytes. The chart keeps changing values ranging from 30GB to 430MB, according to the chart. The time frame between days and weeks also does not change the measure chart. Why is the measuring changing throughout time to what appears to be from high to low and back to high? and, how can see how many bites have been utilized in total? Seems

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David Morales On

You are using a metric that is coupled to current usage, so it is expected to vary over time with increasing or decreasing values.

https://cloud.google.com/bigquery/docs/bi-engine-monitor#metrics

Reservation Used Bytes: Total capacity used in one Google Cloud project

If you need the total bytes you need to switch to this metric:

Reservation Total Bytes Total capacity allocated to one Google Cloud project