SOA-C02 Exam Dumps : AWS Certified SysOps Administrator - Associate (SOA-C02)

Step-by-Step Explanation:

AWS Budgets Overview:

AWS Budgets enables you to set custom cost and usage budgets, and it provides alerts when you exceed those thresholds. It is designed for cost management with minimal operational overhead.

Recurring Cost Budget Creation:

Go to the AWS Budgets Console.

Select Create a budget.

Choose the Cost budget option.

Define whether this budget tracks actual costs or forecasted costs (you will create two budgets, one for each).

Configure the Budget Thresholds:

Set your budget thresholds for both actual costs and forecasted costs.

For example:

Actual Costs Alert: Budget = $1000, Alert at 80% usage ($800).

Forecasted Costs Alert: Budget = $1000, Alert at forecasted usage exceeding 80% ($800).

Alert Configuration:

In the budget creation process, enable Notifications and Actions.

Specify the email addresses or an Amazon SNS Topic to receive alerts.

Set up alerts for both:

Actual Cost Exceeding Budget.

Forecasted Cost Exceeding Budget.

Amazon SNS Setup:

If using an SNS topic, ensure an Amazon SNS topic is created.

Grant appropriate permissions for the Budget service to publish to the SNS topic.

Add subscribers (e.g., email addresses or endpoints) to the SNS topic.

Automation and Monitoring:

Once set up, AWS Budgets continuously monitors actual and forecasted costs.

Alerts are sent automatically when thresholds are breached, reducing manual overhead and reliance on periodic monitoring.

Why This is the Best Option (Least Operational Overhead):

AWS Budgets directly integrates with SNS, allowing real-time alerts without building custom workflows or parsing reports.

It is a native AWS service specifically designed for cost tracking, minimizing complexity and setup time.

No custom code or additional services like Lambda or Step Functions are required, reducing operational maintenance.

This solution is operationally efficient and leverages AWS services to provide notifications when the Lambda function is not invoked, indicating that the file did not arrive.

Steps:

Create a CloudWatch Alarm:

Open the Amazon CloudWatch console.

In the navigation pane, choose "Alarms" and then "Create Alarm".

Select Lambda Metrics:

Choose "Select metric" and then navigate to "AWS Lambda" metrics.

Select the Lambda function that processes the S3 files.

Choose the "Invocations" metric.

Configure the Alarm:

Set the period to 1 hour.

Define the threshold condition to trigger when the Invocations metric is zero.

Under "Additional configuration", configure the alarm to treat missing data as "breaching".

Set Alarm Actions:

Configure the alarm action to send a notification to an Amazon SNS topic.

Create an SNS topic if one does not exist, and subscribe the application team to this topic.

Testing and Verification:

Ensure that the alarm triggers correctly by simulating a missing file scenario and confirming that the notification is sent to the SNS topic.

This approach uses CloudWatch to monitor the invocation frequency of the Lambda function, ensuring that the application team is notified whenever the expected file does not arrive within the specified timeframe.

This is the most operationally efficient solution that meets the requirements, as it will allow the company to monitor the number of times that the web server returns an HTTP 404 response in real-time. The other solutions (creating a CloudWatch Logs subscription filter, an AWS Lambda function, or a script) will require additional steps and resources to monitor the number of times that the web server returns an HTTP 404 response.

A metric filter allows you to search for specific terms, phrases, or values in your log events, and then to create a metric based on the number of occurrences of those search terms. This allows you to create a CloudWatch Metric that can be used to create alarms and dashboards, which can be used to monitor the number of HTTP 404 responses returned by the web server.