What is the default host and port configuration for APM in the SDK?

The default host and port configuration for APM (Application Performance Monitoring) in the SDK is set to localhost and port 8126. This configuration ensures that applications can send trace data to the local Datadog Agent, which listens on this port by default.

Using 'localhost' signifies that the application is communicating with the Datadog Agent running on the same machine, allowing for quick and easy setup. Port 8126 is specifically designated for APM data, making it the standard for most applications integrating with Datadog's APM services. This choice optimizes performance by allowing data to be relayed efficiently without needing to specify external endpoints, leading to streamlined monitoring setup in development environments.

The configurations suggest values that do not align with Datadog's APM defaults and could lead to errors if referenced for production or testing. Therefore, choosing 'localhost' and '8126' is the recommended and reliable setting for effectively utilizing Datadog's APM features.