Azure Function App (Python 3.11 on Linux) stopped detecting all functions after Flex Consumption update – even Basic plan does not work

[insitelyEU]

Hi everyone,

I’m running into a blocking issue with a Python 3.11 Azure Function App on Linux.

Until this week my Function App contained three HTTP-triggered Python functions and everything worked perfectly. After Microsoft rolled out the new Flex Consumption infrastructure, the Azure Portal suddenly shows no functions at all. The “Functions” blade is completely empty and the runtime no longer detects any triggers.

To troubleshoot I tried the following:

Stayed on Flex Consumption → no functions detected

Switched to a Basic App Service Plan → still no functions detected

Tested both folder structures:

A single function_app.py at the root

Each function in its own folder with init.py + function_app.py

Redeployed multiple times (ZIP deploy, VS Code deploy, GitHub Actions)

Confirmed Python version is still 3.11

Created a completely new Function App → same issue

Still, the runtime loads zero functions, not even a minimal test like “ping”.

My questions:

What is the correct folder structure for Python on Linux now?
Has Microsoft changed the requirements with the new Flex Consumption rollout?

Which setting could cause the Python worker to stop scanning for functions?
(e.g. WEBSITE_RUN_FROM_PACKAGE, worker version, app settings…)

Are there known issues with Python on the new Flex Consumption plan?

Why does the same code also fail to load under a Basic plan?
I’m fine running my Function App on Basic if that solves it — I just want the runtime to detect the functions again.

Can someone provide a minimal working folder layout for a Python 3.11 HTTP-triggered Function (Linux), valid today?

Context:

Language: Python 3.11

OS: Linux

Plan tried: Flex Consumption (new model) → not working, Basic → also not working

Deployment: ZIP deploy (no Docker)

Previously working code now loads 0 functions according to the portal and runtime logs.

Any help or a minimal working example is highly appreciated.

Thank you!

[hallvictoria]

Hi @insitelyEU, thanks for reporting.

Are you seeing any specific errors from the logs or App Insights? If you're willing to share your app name privately, we can also take a look on the backend.

After Microsoft rolled out the new Flex Consumption infrastructure

Flex Consumption has been out for over a year now. What rollout are you referring to?

To answer your questions:

What is the correct folder structure for Python on Linux now? / Has Microsoft changed the requirements with the new Flex Consumption rollout?

We recommend using the V2 programming model. The folder structure is documented here. There should only be a single function_app.py file - mixing V1 programming model (init.py + function.json) and V2 (function_app.py) is not supported. The project structure is the same across all plans.

Which setting could cause the Python worker to stop scanning for functions? / Are there known issues with Python on the new Flex Consumption plan? / Why does the same code also fail to load under a Basic plan?

The function app will have the same behavior across all plans. In this scenario, since the app fails on both Flex and Basic, the issue is most likely the app package itself. A couple of things you can check:

• Are the app dependencies being built on Python 3.11 on a Linux OS? If there's a mismatch in the platform that the dependencies were built on (eg, if they were built using 3.12 and Windows), then there could be issues in loading the functions. For simplicity, I'd recommend using remote build to build the dependencies. You can run func azure functionapp publish from Core Tools to build and deploy the app easily.
• You mentioned deploying using Zip Deploy to Flex Consumption - I'm assuming you mean One Deploy?
• You can verify if the function loads and executes successfully locally using Core Tools.

Can someone provide a minimal working folder layout for a Python 3.11 HTTP-triggered Function (Linux), valid today?

• HTTP trigger tutorial
• Samples using other triggers
• Tutorial with different ways to deploy to a flex app

[alexeymarkov]

I have similar issues:

• Flex Consumption
• V2 programming mode;
• Python 3.12
• Remote build via func azure functionapp publish

Yesterday deployment worked today it finishes without any error but there are 0 functions after that. No code changes since yesterday.
Tried Python 3.11 and 3.13 as well - neither works!

UPDATE: I found it:
Yesterday opentelemetry has been updated to 1.39 / 0.60b which is not compatible with azure-monitor-opentelemetry 1.8.2 so I pinned it to 1.38 / 0.59b and now everything works