I use telegram bot for sending allerts from zabbix monitoring system - @crierbot
For using it you need to add @crierbot in to your telegramm  
(if you use android smart phone go to google  play or if use iPhone go to app store, download and install telegram and send command /start )
in replay you will get TOKEN for using in your scripts

My script  /home/m1/telegram.sh  (need to have chmod +x 755)

#!/bin/bash

PATH=$PATH:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin


/usr/bin/curl -s http://localhost:3333 | sed '/ETH/!d; /Total/!d; /Speed/!d;' | awk {'print $6'} | tail -n 1 >> /tmp/totalhash.log

TOKEN=YOUR-TOKEN
TOTALHASH="$(/bin/cat /tmp/totalhash.log)"
TARGET="$(/bin/cat /home/m1/target.log)"

FAN=$(/usr/bin/nvidia-smi --query-gpu=fan.speed --format=csv)
WATT=$(/usr/bin/nvidia-smi --query-gpu=power.draw --format=csv)
TEMP=$(/usr/bin/nvidia-smi --query-gpu=temperature.gpu --format=csv)
GPUHASH=$(curl -s http://localhost:3333  | sed '/GPU/!d; /Mh/!d' | tr -d font'>
sleep 2

if [[ $TARGET > $TOTALHASH ]]; then
        wget -O /dev/null "http://crierbot.appspot.com/${TOKEN}/send?message=Warning!!!
        host $(cat /etc/hostname) too slow hash
        ip: $(ifconfig | grep inet | grep -v inet6 | grep -v 127.0.0.1 | cut -d: -f2 | awk '{printf $1}')
            $FAN
            $WATT
            $TEMP
            $GPUHASH
Total Hash: $TOTALHASH"
    else
        echo > /dev/null
fi

tee /tmp/totalhash.log < /dev/null
#

Also in directory /home/m1 you need to create file target.log and put in average value - hash your rig.
Then you need to add the record in /etc/crontab
0-59 *  * * *   m1      /home/m1/telegram.sh

This script fullfils once in a minute and checks the descriase of total hash.  
If it descriases it sends message where hostname, IP adress, fan speed, watt, temp and hash of every GPU is shown.