PCA (Prometheus Certified Associate) sample exam question with answer 486

Question:
Which of the following functions can be used to compute the rate of increase in a counter metric? (Select all that apply)

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

Answer:
A, B, D - are correct answers. The rate(), irate(), and increase() functions can all be used to compute the rate of increase in a counter metric
C - is incorrect. The delta() function, on the other hand, calculates the difference between the first and last values of a range vector, which can be used for gauges