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Each meter has its own unit, which you can retrieve with the ceilometer meter-list command. See also the user guide.

cpu_util is the instance's CPU utilization measured in percent. Over the measurement interval, your instance had a minimum utilization of 0.15%, max 1.7% and average 0.5%. The possible maximum is 100. Alternatively, you can also use the cpu meter, which measures absolute CPU usage in nanoseconds.

The admin guide has a list of all the meters, including memory-, CPU-, disk- and network-related measurements

You can also use ceilometer sample commands instead of the statistics command and calculate the statistics yourself.

Each meter has its own unit, which you can retrieve with the ceilometer meter-list command. See also the user guide.

cpu_util cpu_util is the instance's CPU utilization measured in percent. The possible maximum value of this meter is 100. Over the measurement interval, your instance had a minimum utilization of the lowest sample was 0.15%, max the highest 1.7% and the average 0.5%. The possible maximum

CPU utilization is 100. Alternatively, you can also use derived from the cpu cpu meter, which measures absolute the instance's CPU usage time in nanoseconds.nanoseconds. Assuming the default sampling interval of 10 minutes or 600 billion nanoseconds, a cpu_util sample of 0.15% means that the instance used the CPU for 600,000,000,000*0.0015 nanoseconds (I hope I got that calculation right and that this paragraph makes sense).

The admin guide has a list of all the meters, including memory-, CPU-, disk- and network-related measurements

You can also use ceilometer sample commands instead of the statistics command and calculate the statistics yourself.