How to view of traffic between version if I implement blue/green deployment

Hello there, you can view the executions per version per alias by click opening your desired step function at this link https://<region>.console.aws.amazon.com/states/home?region=<region>#/statemachines/view/arn:aws:states:<region>:<AccountID>:stateMachine:<StateMachineName>

Then, in the Executions Tab you can filter using the Properties such as Name/Version/Alias. For example: If you enter filter as Version = 1, you will only see executions for that particular version. Similarly you can filter executions filter using Alias.

Additionally, you can also go to the Alias tab or the Versions tab to view the executions for the respective alias/versions.

Feel free to let me know if you face any issues observing the same.

Step Functions has execution metrics for versions and aliases. You can check the ExecutionsSucceeded/Failed metrics for the StateMachineArn and Version dimensions you are interested in.

https://docs.aws.amazon.com/step-functions/latest/dg/procedure-cw-metrics.html#cloudwatch-step-functions-execution-metrics

You can also use the ListExecutions API to filter executions by version or alias ARN https://docs.aws.amazon.com/step-functions/latest/apireference/API_ListExecutions.html#StepFunctions-ListExecutions-request-stateMachineArn