APPLICATIONINSIGHTS_CONNECTION_STRING or APPINSIGHTS_INSTRUMENTATIONKEY is defined but the Application Insights Extension is not installed

Raymond Raymond
Raymond
Raymond
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Issue

Azure functions v4.0 .NET 6 based isolated worker application doesn't start because of the following issue:

Microsoft.Azure.WebJobs.Script: APPLICATIONINSIGHTS_CONNECTION_STRING or APPINSIGHTS_INSTRUMENTATIONKEY is defined but the Application Insights Extension is not installed. Please install the Application Insights Extension. See https://aka.ms/func-applicationinsights-extension for more details.

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Cause

As of Azure Functions host version 4.0.0.16394, Application Insights is no longer included by default. It is now available as a separate extension.

More details: [Azure Functions][V4] Azure Functions 4.0.0-preview.5.16714 (breaking changes) #348

[Azure Functions] [V4] Application Insights is now available as an extension (breaking change) #346 

Resolution

For in-process .NET apps, install version 1.0.0-preview4 or later of the Microsoft.Azure.WebJobs.Extensions.ApplicationInsights extension package.

For isolated .NET apps, install version 1.0.0-preview4 or later of the Microsoft.Azure.Functions.Worker.Extensions.ApplicationInsights extension package. Also, make sure that the Microsoft.Azure.Functions.Worker and Microsoft.Azure.Functions.Worker.Sdk are updated to the latest versions.

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If you cannot find find the extension package, you can directly add it into your project reference:

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Local debug screenshot:

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