Which of the following best describes Custom Metrics Retention?

Custom Metrics Retention in Dynatrace is primarily influenced by the DDU usage plan, which stands for Data Driven Units. This plan dictates how long custom metrics can be retained based on the specific usage and licensing a customer has invested in. Users of Dynatrace can create numerous custom metrics that aid in monitoring unique application behaviors, but the retention of these metrics is tied directly to the limits set by the DDU usage plan.

This means that depending on your organization's specific plan, certain metrics may be retained longer or shorter. It is essential to understand that there are implications for storage and retention based on the metrics that a business decides to track and report on, as governed by their subscription tier.

Retention based on user request, losing metrics after 30 days, or keeping metrics only if they relate to performance issues do not accurately reflect the structure and governance of custom metrics retention within Dynatrace. Each of these options does not encompass the broader context of how data retention is structured by Dynatrace's licensing model, thus making the DDU usage plan the most accurate description of custom metrics retention.