Which of the following is NOT a channel for metric ingestion in Dynatrace?

The Datadog API is not a channel for metric ingestion in Dynatrace because Dynatrace is an independent monitoring and performance management solution that does not natively support integration with the Datadog API for ingesting metrics. Instead, Dynatrace provides its own set of APIs, such as the Metrics API v2 and OneAgent REST API, which are specifically designed to gather and process metrics within its ecosystem. Additionally, Telegraf is a widely used agent for collecting metrics that can feed into various monitoring systems, including Dynatrace, making it a valid avenue for ingestion. Therefore, identifying the Datadog API as the answer demonstrates an understanding of the tools and their intended ecosystems within monitoring solutions.