What is the most important driver to determine a metrics tracking cycle?

According to the CTSC exam content manual1, the most important driver to determine a metrics tracking cycle is the change frequency, which is the rate at which the metric value changes over time. The change frequency affects how often the metric should be measured and reported, as well as the level of detail and aggregation required. A metric with a high change frequency should be tracked more frequently and with more granularity than a metric with a low change frequency.