PCA (Prometheus Certified Associate) sample exam question with answer 606

Question:
Which metric type is used to represent a single numerical value that can arbitrarily go up and down, such as the number of concurrent requests?

1. Counter
2. Gauge
3. Histogram
4. Summary

Answer:
B - is the correct answer. Gauges are used to represent a single numerical value that can go up and down, such as the number of concurrent requests