Each APM host includes how many ingested spans?

The correct answer reflects the data volume that is allocated for ingested spans in APM (Application Performance Monitoring) hosts within Datadog's framework. Specifically, 150 GB signifies the amount of span data that can be ingested for monitoring application performance.

Spans are a fundamental aspect of tracing, representing a unit of work or an operation within a distributed system. They allow you to see how requests move through your architecture, offering insights into performance bottlenecks and areas for optimization.

Understanding the data limits for ingested spans is crucial for developers and engineers working with Datadog, as it impacts their ability to monitor and troubleshoot applications effectively. Knowing that each APM host can handle 150 GB helps users anticipate how much trace data can be collected and analyzed, ensuring that they make informed decisions when configuring their APM setup.

In contrast, the other figures presented don't reflect the correct data limits for ingested spans within the APM framework, which is specifically tailored to provide users with a standard usage guideline for performance monitoring in Datadog.