It returns the value of an environment variable that has given name.
It returns the value of the POWERTOOLS_SERVICE_NAME environment variable.
It returns the value of the _X_AMZN_TRACE_ID environment variable.
The AWS X-Ray Trace data available in the environment variable has this format:
Root=1-5759e988-bd862e3fe1be46a994272793;Parent=557abcec3ee5a047;Sampled=1,
The actual Trace ID is: 1-5759e988-bd862e3fe1be46a994272793.
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Class EnvironmentVariablesService
This class is used to return environment variables that are available in the runtime of the current Lambda invocation. These variables can be a mix of runtime environment variables set by AWS and variables that can be set by the developer additionally.
https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html#configuration-envvars-runtime
https://awslabs.github.io/aws-lambda-powertools-typescript/latest/#environment-variables