PCA (Prometheus Certified Associate) sample exam question with answer 13

Question:
What is a label in Prometheus?

1. A group of metrics that are scraped together
2. A metric that represents the overall status of a target
3. A key-value pair that provides additional information about a metric
4. A rule that triggers an alert when certain conditions are met

Answer:
C - A label is a key-value pair that provides additional information about a metric.
This information can be used to filter and aggregate metrics in various ways.