Setting custom alert thresholds for disk and shmem monitoring

Alert thresholds are defined in /etc/pihole/pihole-FTL.conf

Set disk usage alert threshold level, 98% in this example:

echo "CHECK_DISK=98" >> /etc/pihole/pihole-FTL.conf

Disable shmem alert:

echo "CHECK_SHMEM=0" >> /etc/pihole/pihole-FTL.conf

The above commands add alert thresholds to pihole-FTL.conf If you already set a threshold, edit pihole-FTL.conf to adjust the existing values.