What monitoring and alerting scenarios in AWS cloud have you worked with using CloudWatch?

Using AWS CloudWatch, I handled the following monitoring and alerting scenarios:

• EC2 Instance Performance Monitoring: tracking CPU, memory, disk activity metrics, and creating alarms when thresholds are exceeded.
• Application Status Monitoring: collecting custom metrics from applications and setting up alerts for anomalies.
• Log Management and Log Analysis: integrating with CloudWatch Logs for log collection and filtering, setting alerts for error occurrences.
• AWS Service Monitoring: for example, checking RDS, Lambda function statuses, and creating notifications for failures.

Example of setting up a CPU alarm on EC2 using Python and boto3:

import boto3

cloudwatch = boto3.client('cloudwatch')

cloudwatch.put_metric_alarm(
    AlarmName='HighCPUUtilization',
    MetricName='CPUUtilization',
    Namespace='AWS/EC2',
    Statistic='Average',
    Period=300,
    EvaluationPeriods=2,
    Threshold=80.0,
    ComparisonOperator='GreaterThanThreshold',
    Dimensions=[{'Name': 'InstanceId', 'Value': 'i-1234567890abcdef0'}],
    AlarmActions=['arn:aws:sns:region:account-id:my-sns-topic']
)