Combine with datadog #502

Hi there,

we would like to integrate the lambda-adapter with a datadog agent.
According to their docs (https://docs.datadoghq.com/serverless/aws_lambda/installation/nodejs/?tab=containerimage) we have to set the DD_LAMBDA_HANDLER env-var to the original handler.
When using the lambda-adapter, there is no real handler, can you give guidance on what to do in this case?