PCA (Prometheus Certified Associate) sample exam question with answer 348

Question:
Which of the following functions can be used to calculate the rate of change of a counter over time?

1. increase()
2. delta()
3. rate()
4. sum()

Answer:
C - correct answer. The rate function is used to calculate the rate of change of a counter over time. It does this by taking the derivative of the counter with respect to time. The result is a gauge vector that represents the rate of change of the counter