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Difficulty: MediumCost Allocation Tags

A company's finance team is attempting to track cloud costs using a user-defined cost allocation tag named 'ProjectID' and the AWS-generated cost allocation tag 'aws:createdBy'. Although developers have applied these tags to several active Amazon EC2 instances, the tags are not appearing in the company's billing reports or AWS Cost Explorer. Which of the following describes the correct action and behavior required to make these tags visible on the billing reports?

  1. Activate both the 'ProjectID' and the 'aws:createdBy' tags within the AWS Billing and Cost Management console, which will cause them to appear on future billing reports without retroactively updating historical costs.Answer
  2. B
    Enable the tags within AWS Resource Groups to automatically group the EC2 instances; this will publish both tag types retroactively to all past and future billing reports.
  3. C
    Define an IAM policy that mandates tagging on EC2 instances; once applied, AWS will automatically populate these tags on both historical and future AWS Cost and Usage Reports.
  4. D
    Activate the user-defined 'ProjectID' tag in the Billing and Cost Management console and enable the AWS-generated 'aws:createdBy' tag in AWS Resource Explorer; this will apply both tags retroactively.

Answer

Activate both the 'ProjectID' and the 'aws:createdBy' tags within the AWS Billing and Cost Management console, which will cause them to appear on future billing reports without retroactively updating historical costs.
Cost allocation tags, whether user-defined or AWS-generated, must be activated in the AWS Billing and Cost Management console before they can be used to track costs in reports or Cost Explorer. These tags do not apply retroactively, meaning they will only track cost data from the time of activation forward.

Step-by-Step Solution

1
Identify that cost allocation tags must be explicitly enabled for billing tracking.
Applying tags directly to resources makes them available for search/organization, but not for cost tracking.
AWS requires activation so that it knows which tag keys to include in the billing datasets and reports.
2
Select the correct location for tag activation.
Both user-defined ('ProjectID') and AWS-generated ('aws:createdBy') tags must be activated in the Billing and Cost Management console.
This is the single centralized place where billing-related tag schemas are managed.
3
Determine the temporal behavior of cost allocation tags.
Activated tags only apply from the time of activation forward.
AWS does not recalculate historical billing files dynamically for retroactive tag applications.

Key Concept

Activation and behavior of cost allocation tags
Estimated Time:1m 0s
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Topics

Cost Allocation Tags

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