Merge pull request #347 from hjgraca/docs-clarify-xray-over-adot

Author: hjgraca

docs/core/tracing.md

@@ -26,6 +26,8 @@ Powertools for AWS Lambda (.NET) are available as NuGet packages. You can instal
 
 ## Getting Started
 
+!!! note "Tracer relies on AWS X-Ray SDK over [OpenTelememetry Distro (ADOT)](https://aws-otel.github.io/docs/getting-started/lambda){target="_blank"} for optimal cold start (lower latency)."
+
 Before you use this utility, your AWS Lambda function [must have permissions](https://docs.aws.amazon.com/lambda/latest/dg/services-xray.html#services-xray-permissions) to send traces to AWS X-Ray.
 
 To enable active tracing on an AWS Serverless Application Model (AWS SAM) AWS::Serverless::Function resource, use the `Tracing` property. You can use the Globals section of the AWS SAM template to set this for all