Azure App Service Site Extensions

Question

Azure App Service Site Extensions

Muthusamy, Reegan 20

Hi,

Is Azure App Service Site Extensions Are Being Phased Out and this no longer supported.

Muthusamy, Reegan 20 Reputation points

2026-04-07T16:12:54.3433333+00:00

we need to enable new relic extension for azure web app running with dotnet v8.0
Golla Venkata Pavani 3,415 Reputation points Microsoft External Staff Moderator

2026-04-07T17:55:38.2466667+00:00
Hi @Muthusamy, Reegan

Thank you for reaching us regarding the issue.

Azure App Service Site Extensions are not deprecated and are still supported as a platform feature.

It continues to describe Site Extensions as a supported extensibility mechanism for Azure App Service. There is no deprecation or retirement notice published by Microsoft for App Service Site Extensions in any Azure retirement announcements or App Service documentation.

It publishes retirement notices when a feature is being phased out, and Site Extensions are not listed among any retired or soon‑to‑be‑retired App Service capabilities.

Key point from Microsoft documentation:

Site Extensions remain part of the Azure App Service platform and are supported by Azure.

Microsoft does not announce any plan to phase them out.

.NET 8 Support on Azure App Service:

Microsoft fully supports .NET 8 on Azure App Service (Windows and Linux).

Microsoft officially announced .NET 8 General Availability on Azure App Service, confirming that applications targeting .NET 8 are supported on the platform.

Important Microsoft Support Boundary (Third‑Party Extensions)

Per Microsoft documentation and support policy:

Microsoft supports the App Service platform and the runtime availability (such as .NET 8).

Microsoft does not certify, validate, or guarantee compatibility of third‑party Site Extensions with specific .NET runtime versions, including .NET 8.

Compatibility and support for third‑party extensions (such as New Relic) are the responsibility of the extension publisher, not Azure App Service.

This distinction is consistent across Azure App Service documentation, which defines Site Extensions as a platform capability but does not document runtime compatibility for individual third‑party extensions.

Reference:
https://learn.microsoft.com/en-us/azure/app-service/
https://learn.microsoft.com/en-us/azure/app-service/overview-diagnostics
https://azure.github.io/AppService/2023/11/14/dotnet8-ga.html
https://learn.microsoft.com/en-us/azure/app-service/overview#shared-responsibility-model

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.

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Muthusamy, Reegan 20 Reputation points

2026-04-07T16:12:54.3433333+00:00

we need to enable new relic extension for azure web app running with dotnet v8.0

Answer 1

Azure App Service site extensions are not indicated as being phased out or unsupported in the provided information.

Site extensions are still described as a supported mechanism to extend and monitor Azure App Service apps, including:

Application performance monitoring using site extensions such as Azure Application Insights.
Management and tooling extensions (for example, source code editors or tools for connected resources like MySQL).

No deprecation or retirement notice for App Service site extensions appears in the context. By contrast, the context explicitly calls out deprecation for other services (for example, Cloud Services (extended support)), which would be expected if site extensions were being phased out.

References:

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Azure App Service Site Extensions

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