What does the value 'nan' mean in the context of a cluster P service?

The value "nan" (Not a Number) in the context of a service like cluster P usually indicates that there is no numerical value for this parameter or metric, or that it is undefined. In clusters and monitoring systems, this can indicate:

• Absence of data or a failure in metric collection.
• Incorrect calculation of the value (e.g., division by zero).
• An error in the configuration or operation of the service.

For example, if cluster P collects CPU load statistics, and at some point, data is not received, the reports or dashboards may display "nan" instead of a number. This signals engineers to check the monitoring status or the cluster itself.