Which method is used for tracking metrics per host in Datadog APM?

The Host Metrics API is specifically designed for tracking metrics associated with individual hosts in Datadog APM (Application Performance Monitoring). This API allows users to gather and send metrics that relate directly to the performance and behavior of each host in their infrastructure. By utilizing the Host Metrics API, users can achieve a granular view of resource consumption, application performance, and other key performance indicators at the host level. This facilitates detailed monitoring and troubleshooting of applications running on those hosts.

In contrast, other options such as service checks, tracing explorer, and metrics explorer serve different purposes within Datadog. Service checks are used for monitoring the status of services rather than tracking host-specific metrics. The tracing explorer focuses on visualizing and analyzing traces of requests across distributed systems, which is essential for understanding application performance but doesn't provide host-specific metrics. Metrics explorer is a tool for aggregating and visualizing metrics across various dimensions, but it is not specifically used for the purpose of tracking metrics per host. Each tool is valuable within its context, but the Host Metrics API is distinctly suited for tracking metrics on a per-host basis.