PCA (Prometheus Certified Associate) sample exam question with answer 521

Question:
You are instrumenting an HTTP API with Prometheus metrics. You want to define a metric that tracks the number of HTTP requests that have been made to your API.
Which of the following metric names and types is the MOST appropriate for this situation?

1. http_requests_total, Histogram
2. http_requests_total, Counter
3. http_requests, Histogram
4. http_requests, Counter

Answer:
B - is the correct answer. More at metric_types and metric-names
A, C - is incorrect as a histogram is ideal for tracking observations in defined buckets. In this scenario, a counter is sufficient as we only want to count the number of requests received
D - is incorrect as it is a best practice of Prometheus metric naming to include a total suffix for an accumulating count