greengrass lambda does not register as a lambda environment

The following line determines if the code is running as a lambda:
https://github.com/awslabs/aws-embedded-metrics-python/blob/658b2ebe829853a0ad53675d4b9d8917f7de18b7/aws_embedded_metrics/environment/lambda_environment.py#L32

Unfortunately the environment variables for lambdas are not provided by greengrass' version of lambdas. This means my aws-embedded-metrics agent attempted TCL connections from my greengrass lambda and was failing until I manually added AWS_LAMBDA_FUNCTION_NAME as an env variable with the function name.