[Delayed] Removal of older Azure Functions Runtime version: 4.23.0

[VpOfEngineering]

Older versions of Azure Functions are regularly removed from the production environment. Going forward we will be using issues in this repo to announce when that is happening. The following versions of Azure Functions V4 are being removed from the production environment.

• 4.23.0

If your function app is configured to run on any of these versions (using the FUNCTIONS_EXTENSION_VERSION app setting) you will soon find that the app is instead loading the latest version automatically.

Please use https://github.com/Azure/app-service-announcements-discussions/issues/338 for discussions related to the removal of these versions.

[jvmlet]

What is the release lifecycle of functions runtime? Which versions are considered as LTS? Where the roadmap of releases can be found, list of backwards INcompatible changes? With such breaking changes without proper communication you will soon find that adoption of az function changes, slightly.

[brettsam]

We don't ever intend to introduce breaking changes in a major version. We want everyone always to up on the latest (~4) version of the host (and we typically only keep 1 or 2 older versions around).

These breaking changes that folks are hitting with 4.23.0 are unintended, so we've paused the removal of 4.23.0 until we can fix them and get everyone back on the latest build.

Please give your feedback in the discussion topic here -- and let us know what issues you were hitting in 4.23.0: https://github.com/Azure/app-service-announcements-discussions/issues/338