PCA (Prometheus Certified Associate) sample exam question with answer 443

Question:
In Grafana, what visualization would be MOST appropriate for displaying the memory utilization of a server over time?

1. Gauge
2. Heatmap
3. Table
4. Time Series

Answer:
D - is correct answer. More at Grafana visualizations
A - is incorrect as gauges only display the current value of a metric, not the value over time
B - is incorrect as this type of visualization is ideal for use with Prometheus histogram metrics while memory utilization is a gauge metric
C - is incorrect. While tables can display the value of a metric over time, a Time Series visualization is a better choice