This script checks if celerybeat is service is down then it will notify admin via email then it will keep the celerybeat running.

celerybeat_alert.sh

#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/home/ubuntu
status=$(sudo supervisorctl status celerybeat | grep -o FATAL)
if [ "$status" == "FATAL" ]
 then
    echo "Celerybeat service is Down!" | mail -s "Celerybeat Down" admin@domain.com, admin2@domain.com, admin3@domain.com > /dev/null 2>&1
    sudo supervisorctl restart all > /dev/null 2>&1
    status=$(sudo supervisorctl status celerybeat | grep -o RUNNING)
    if [ "$status" == "RUNNING" ]
     then
      echo "Celerybeat service is Up!" | mail -s "Celerybeat Up" admin@domain.com, admin2@domain.com, admin3@domain.com > /dev/null 2>&1
    fi
fi

#run this script every 5 minutes
#cronjob email in `sudo crontab -e`
*/5 * * * * /bin/bash /home/ubuntu/celerybeat_alert.sh