Add Instrumentation for AWS Lambda handler function

[wangzlei]

Background

Package Link: https://docs.aws.amazon.com/lambda/latest/dg/golang-handler.html

Support OpenTelemetry in AWS GoLang/Custom Runtime. Instrument user's handler function in AWS Lambda. Refer other language such as [Java](https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/instrumentation/aws-lambda-1.0), Js, [Python](https://github.com/open-telemetry/opentelemetry-lambda/tree/main/python/src/otel/otel_sdk/opentelemetry/instrumentation/aws_lambda), [.Net](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/tree/main/src/OpenTelemetry.Contrib.Instrumentation.AWSLambda).

Proposed Solution

1. generate span by wrapping user's Lambda handler function
2. adding faas resource attributes by a LambdaReourceDetector

See OpenTelemetry Lambda proposal in https://github.com/open-telemetry/opentelemetry-lambda/blob/main/docs/design_proposal.md

Tracing

• attributes:
  • https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/semantic_conventions/faas.md
• events:
• links:

Metrics

Instruments

• :
  • type:
  • unit:
  • description:
  • attributes:

Prior Art

Tasks

• Code complete:
  • Comprehensive unit tests.
  • End-to-end integration tests.
  • Tests all passing.
  • Instrumentation functionality verified.
• Documented
  • Added to the OpenTelemetry Registry
  • README included for the module describing high-level purpose.
  • Complete documentation of all public API including package documentation.
  • Instrumentation documentation updated.
• Examples
  • Dockerfile file to build example application.
  • docker-compose.yml to run example in a docker environment to demonstrate instrumentation.