waits for a ping failure, then notifies over discord (when you need to babysit a host)

pingdown_notify_discord.sh

#!/bin/bash

DEFAULT_IP="1.1.1.1"

# Assign the first argument to IP, or use DEFAULT_IP if $1 is empty or unset
IP="${1:-$DEFAULT_IP}"

# Loop *while* the host is responding
while ping -c 1 "$IP" &> /dev/null; do
  sleep 1
done

# If we exit the loop, ping failed
# uses https://github.com/NoireNetworks/notify_discord
notify_discord.sh "Host $IP is DOWN"