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For detailed steps on how to perform build and deploy, please refer to document. Deploy through FlexDeploy for AWS plugin
After Deploy Execution
We have one Alias name as Prod and which is currently pointing to the function version 18 ( Blue deployment ), and 100% traffic is shift to this function version.
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Once the deploy execution completed we can see that new function version is published and 20% of traffic will shift to this newly published version 19 ( Green deployment ) and remaining 80% will shift to old, stable version 18 . ( Blue deployment ).