Is the 150k indexed spans per function limit applicable exclusively to AWS Lambda functions?

The statement is true because the limit of 150,000 indexed spans per function specifically pertains to AWS Lambda functions within the Datadog monitoring system. This limit is designed to ensure that the performance and data handling capabilities of Datadog are optimized for serverless environments like AWS Lambda. Functionally, AWS Lambda can have numerous invocations, and without such a limit, data could become overwhelming or lead to increased costs without significant performance gains.

The particular nature of AWS Lambda, being an event-driven and ephemeral compute service, makes it important to set such thresholds. This limit does not apply to other types of functions or compute environments outside of AWS Lambda, which signifies the targeted application of this rule. As a result, the other options do not accurately capture the scope of application of this limit. The limit is not adjustable based on traffic levels or specific geographic regions, reinforcing the understanding that it is clearly tied to AWS Lambda functions alone.