Even though the Azure Functions runtime 2.0 and 3.0 were retired on December 13th, 2022 , I recently still found some Azure Functions using these older runtimes. See Azure Functions runtime versions overview which outlines the support for the different version.
Azure Functions that use runtime version 2.x or 3.x will continue to run but Microsoft is no longer providing updates or support for applications that use these versions. There a number of reasons why you should upgrade:
- Leverage the support for the latest programming languages such as .NET 6 and Node 16. Take the opportunity to upgrade your code to .NET 6 since .NET 6 includes a lot of performance improvements
- To make sure that you keep getting security updates
- Be future proof and keep technical debt to a minimum (See Technical debt and Dynamics 365 solution architecture for my view on this)
What is the Azure Functions runtime?
For those not so familiar with Azure Functions, the Azure Functions runtime is the engine that powers Azure Functions to execute user-defined code (written in . It is responsible for loading the user's code, executing it in response to specific triggers, and scaling the execution as needed to handle the workload. The runtime is a key component of the Azure Functions service, and it allows developers to focus on writing and deploying their code, rather than worrying about the underlying infrastructure.
How to find the Azure Functions runtime version?
When you log in to the Azure Portal and go to the Function runtime settings tab on the configuration page of an Azure function, you will see which runtime version is in use. Instead of having to look at every individual function, you might also take a look at the Azure Resource Graph
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