PCA (Prometheus Certified Associate) sample exam question with answer 367

Question:
Which of the following describes the summary metric type?

1. Represents a single numerical value that can arbitrarily go up or down
2. Samples numerical observations and calculates configurable quantiles over a sliding time window
3. Represents a monotonically increasing numerical value
4. Samples numerical observations and counts them in configurable buckets

Answer:
B - is the correct answer. More at summary
A - this describes the gauge metric type
C - this describes the counter metric type
D - this describes the histogram metric type