PCA (Prometheus Certified Associate) sample exam question with answer 190

Question:
Which of the following functions can be used in PromQL to perform aggregation over dimensions?

1. rate()
2. increase()
3. count_over_time()
4. irate()
5. topk()

Answer:
C, E - The count_over_time() function can be used to count the number of time series with the same set of labels. The topk() function can be used to find the top k time series based on a given label set