#!/bin/bash

# determine host name: try hostname command, otherwise use $HOSTNAME
if command -v hostname &>/dev/null; then
  host=$(hostname)
else
  host="$HOSTNAME"
fi

# send the Telegram message
/usr/bin/curl -s -X POST \
  "https://api.telegram.org/bot${telegram_bot_token}/sendMessage" \
  -d chat_id="${telegram_chat_id}" \
  -d text="service $1 on ${host} failed"