PCA (Prometheus Certified Associate) sample exam question with answer 148

Question:
Which query will give sum of all filesystems on the machine? The metric node_filesystem_size_bytes will list out all of the filesystems and their total size.

node_filesystem_size_bytes{device="/dev/sda2", fstype="vfat", instance="192.168.1.168:9100", mountpoint="/boot/efi"} 536834048
node_filesystem_size_bytes{device="/dev/sda3", fstype="ext4", instance="192.168.1.168:9100", mountpoint="/"} 13268975616
node_filesystem_size_bytes{device="tmpfs", fstype="tmpfs", instance="192.168.1.168:9100", mountpoint="/run"} 727924736
node_filesystem_size_bytes{device="tmpfs", fstype="tmpfs", instance="192.168.1.168:9100", mountpoint="/run/lock"} 5242880
node_filesystem_size_bytes{device="tmpfs", fstype="tmpfs", instance="192.168.1.168:9100", mountpoint="/run/snapd/ns"} 727924736
node_filesystem_size_bytes{device="tmpfs", fstype="tmpfs", instance="192.168.1.168:9100", mountpoint="/run/user/1000"} 727920640

1. sum(node_filesystem_size_bytes{instance="192.168.1.168:9100"})
2. count(node_filesystem_size_bytes{instance="192.168.1.168:9100"})
3. node_filesystem_size_bytes{instance="192.168.1.168:9100"} + node_filesystem_size_bytes
4. node_filesystem_size_bites(sum)

Answer:
A - is the correct answer