How can one retrieve data measurements from AWS Cross-Account CloudWatch through ingestion?

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In order to retrieve data measurements from AWS Cross-Account CloudWatch via ingestion, you will need to:

1. Set up cross-account access to CloudWatch: This will allow you to grant access to one AWS account from another AWS account. To do this, you will need to create an IAM role in the receiving account, and then grant permissions to the providing account.

2. Set up ingestion: You will need to configure custom metric filters on the providing account to send the data you want to the receiving account. This can be done by creating a subscription filter and specifying the destination log group in the receiving account.

3. Retrieve data measurements: Once the ingestion has been set up, you can retrieve data measurements from the receiving account's CloudWatch console or through the CloudWatch API. To retrieve the data, you will need to specify the appropriate metric name, namespace, and dimensions.

Note that the specific steps required may vary depending on your use case and specific configuration. It's important to review the AWS documentation and follow best practices for securing and managing cross-account access.