PCA (Prometheus Certified Associate) sample exam question with answer 136

Question:
You are writing your own exporter for a Redis database. Which of the following would be the correct name for a metric to represent used memory on the by the Redis instance?

1. redis_mem_used_kilobytes
2. used_mem_redis_bytes
3. redis_used_bytes_mem
4. redis_mem_used_bytes

Answer:
D - Check metric names