Sending CloudWatch Alarm Status To Telegram

In this post, we’ll see how we can send CloudWatch Alarm status to Telegram.

Pre-requisite: For this demo, we’ve created an EC2 instance and set up a CloudWatch alarm on CPUUtilization metric.

Step 1: Open Telegram, search @BotFather and send “/start” message.

Step 2: Send “/newbot” message, and follow the instructions to setup a name and a username. Note down the token you get once the bot is created.

Step 3: Now search your bot and send a message from a mobile device(don’t use Telegram desktop application).

Step 4: Next we need to fetch chat id. For this go to https://api.telegram.org/bot<yourtoken>/getUpdates (replace <yourtoken> with the token we got in Step 2).

Note down the value for id field from the response you get. If you see an empty response, try sending another message.

Step 5: Now go to AWS console and create a Python 3.9 lambda function with the given code. Replace <yourtoken> and. <chatid> with appropriate values.

import json
import urllib3def lambda_handler(event, context):
    
    
    instance_id=event['detail']['configuration']['metrics'][0]['metricStat']['metric']['dimensions']['InstanceId']
    bot_token = '<yourtoken>'
    bot_chatID = '<chatid>'
    message=instance_id + " breached CPU utilization threshold."
    send_text = 'https://api.telegram.org/bot' + bot_token + '/sendMessage?chat_id=' + bot_chatID + '&parse_mode=Markdown&text=' + message
    
    http = urllib3.PoolManager()
    response = http.request("GET", send_text)
    return (response.status)

Step 6: Next create an Eventbridge rule with following pattern.Replace <cloudwatch_alarm_arn> with appropriate value. You can get the ARN by selecting your CloudWatch alarm, going to Details section and clicking on View EventBridge rule.

{
  "source": [
    "aws.cloudwatch"
  ],
  "detail-type": [
    "CloudWatch Alarm State Change"
  ],
  "resources": [
    "<cloudwatch_alarm_arn>"
  ],
  "detail": {
    "state": {
      "value": [
        "ALARM"
      ]
    }
  }
}

Set Target as your lambda function which we created in Step 5.

Step 7: Now connect to your EC2 instance and generate some load by executing following command:

for i in 1 2 3 4; do while : ; do : ; done & done

Once our alarm threshold is breached, you should get a message on Telegram.

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