docs: update readme to clarify that the collector layer should be used alongside language layers (#1665)

* docs: update readme to clarify that the collector layer should be used alongside language layers

* Add clarification of auto vs manual instrumentation for go/dotnet applications

Author: arun-annamalai

README.md

@@ -8,20 +8,27 @@
 
 ## OpenTelemetry Lambda Layers
 
-The OpenTelemetry Lambda Layers provide the OpenTelemetry (OTel) code to export telemetry asynchronously from AWS Lambda functions. It does this by embedding a stripped-down version of [OpenTelemetry Collector Contrib](https://github.com/open-telemetry/opentelemetry-collector-contrib) inside an [AWS Lambda Extension Layer](https://aws.amazon.com/blogs/compute/introducing-aws-lambda-extensions-in-preview/).
+The OpenTelemetry Lambda Layers provide the OpenTelemetry (OTel) code to export telemetry asynchronously from AWS Lambda functions. It does this by embedding a stripped-down version of [OpenTelemetry Collector Contrib](https://github.com/open-telemetry/opentelemetry-collector-contrib) inside an [AWS Lambda Extension Layer](https://aws.amazon.com/blogs/compute/introducing-aws-lambda-extensions-in-preview/). This allows Lambda functions to use OpenTelemetry to send traces and metrics to any configured backend.
 
-Some layers include the corresponding OTel language SDK for the Lambda. This allows Lambda functions to use OpenTelemetry to send traces and metrics to any configured backend.
+There are 2 types of lambda layers
+1. Collector Layer - Embeds a stripped down version of the OpenTelemetry Collector
+2. Language Specific Layer - Includes language specific nuances to allow lambda functions to automatically consume context from upstream callers, create spans, and automatically instrument the AWS SDK
 
-## Extension Layer Language Support
+These 2 layers are meant to be used in conjunction to instrument your lambda functions. The reason that the collector is not embedded in specific language layers is to give users flexibility
 
-* ### [Python + Collector Lambda Layer](python/README.md)
-* ### [Java + Collector Lambda Layer](java/README.md)
-* ### [NodeJS + Collector Lambda Layer](nodejs/README.md)
-* ### [.NET + Collector Lambda Layer](dotnet/README.md)
-* ### [Ruby + Collector Lambda Layer](ruby/README.md)
-* ### [Go + Collector Lambda Layer](go/README.md)
+## Collector Layer
 * ### [Collector Lambda Layer](collector/README.md)
 
+## Extension Layer Language Support
+* ### [Python Lambda Layer](python/README.md)
+* ### [Java Lambda Layer](java/README.md)
+* ### [NodeJS Lambda Layer](nodejs/README.md)
+* ### [Ruby Lambda Layer](ruby/README.md)
+
+## Additional language tooling not currently supported
+* ### [Go Lambda Library](go/README.md)
+* ### [.NET Lambda Layer](dotnet/README.md)
+
 ## FAQ
 
 * **What exporters/receivers/processors are included from the OpenTelemetry Collector?**

dotnet/README.md

@@ -1,6 +1,6 @@
 # OpenTelemetry Lambda .NET
 
-Nuget package and layer for running .NET applications on AWS Lambda with OpenTelemetry.
+Nuget package for running .NET applications on AWS Lambda with OpenTelemetry.
 
 ## Provided SDK
 

go/README.md

@@ -1,12 +1,16 @@
 # OpenTelemetry Lambda Go
 
-Layer for running Go applications on AWS Lambda with OpenTelemetry.
+Examples of Go applications on AWS Lambda with OpenTelemetry.
 
 ## Provided SDK
 
 [OpenTelemetry Lambda SDK for Go](https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/instrumentation/github.com/aws/aws-lambda-go/otellambda) includes tracing APIs to instrument Lambda handler.
 For other instrumentations, such as http, you'll need to include the corresponding library instrumentation from the [instrumentation project](https://github.com/open-telemetry/opentelemetry-go) and modify your code to use it in your function.
 
+## Provided Layer
+
+[OpenTelemetry Lambda Layer for Collector](https://aws-otel.github.io/docs/getting-started/lambda/lambda-go#lambda-layer) includes OpenTelemetry Collector for Lambda components. Follow [user guide](https://aws-otel.github.io/docs/getting-started/lambda/lambda-go#enable-tracing) to apply this layer to your Lambda handler that's already been instrumented with OpenTelemetry Lambda .NET SDK to enable end-to-end tracing.
+
 ## Sample application
 
 The [sample application](https://github.com/open-telemetry/opentelemetry-lambda/tree/main/go/sample-apps/function/function.go) shows the manual instrumentations of OpenTelemetry Lambda Go SDK on a Lambda handler that triggers downstream requests to AWS S3 and HTTP.