lambda function to make a pretty SNS notification instead of JSON

prettify.py

#!/usr/bin/env python

from __future__ import print_function
import boto3
print('Loading function')

#set region
REGION = 'us-west-2'
#set the SNS topic ARN you want to alert on
SNS_TOPIC_ARN = 'arn:aws:sns:REGION:ACCOUNT_ID:TOPIC_NAME'

def lambda_handler(event, context):
    sns_body = 'Instance {} has changed to {} state at {} UTC'.format(event['detail']['instance-id'], event['detail']['state'], event['time'])
    client = boto3.client('sns', region_name=REGION)
    response = client.publish(
        TopicArn=SNS_TOPIC_ARN,
        Subject='Instance state change notification',
        Message=sns_body
    )