CODEWITHSUNDEEP
azureazure-functionsazure-application-insights
Niels Brinch
Niels Brinch

Reputation: 3612

Why do I need both APPINSIGHTS_INSTRUMENTATIONKEY and APPLICATIONINSIGHTS_CONNECTION_STRING in my Azure Function configuration?

APPINSIGHTS_INSTRUMENTATIONKEY contains the instrumentation key for Application Insights.

APPLICATIONINSIGHTS_CONNECTION_STRING contains the instrumentation key for Application Insights prefixed with InstrumentationKey=.

That seems pointless unless each value enables certain features with Application Insights.

Upvotes: 35

Views: 27647

Answers (4)

Enrico
Enrico

Reputation: 3454

You'll only need to set the application insights connection string. Either in your appsettings.json

{
  "ApplicationInsights": {
    "ConnectionString" : "InstrumentationKey=00000000-0000-0000-0000-000000000000;IngestionEndpoint=https://{region}.in.applicationinsights.azure.com/;LiveEndpoint=https://{region}.livediagnostics.monitor.azure.com/"
    }
}

Or as an environment parameter. In Azure under settings-> configuration -> application settings:

  {
    "name": "APPLICATIONINSIGHTS_CONNECTION_STRING",
    "value": "InstrumentationKey=xxxxxx-xxxx-xxxx-xxxx-xxxxx;IngestionEndpoint=https://westeurope-5.in.applicationinsights.azure.com/;LiveEndpoint=https://westeurope.livediagnostics.monitor.azure.com/",
    "slotSetting": true
  },

Upvotes: 1

Krzysztof Madej
Krzysztof Madej

Reputation: 40603

APPINSIGHTS_INSTRUMENTATIONKEY is deprecated:

On March 31, 2025, support for instrumentation key ingestion will end. Instrumentation key ingestion will continue to work, but we'll no longer provide updates or support for the feature. Transition to connection strings to take advantage of new capabilities.

And if you use APPINSIGHTS_INSTRUMENTATIONKEY you should migrate to APPLICATIONINSIGHTS_CONNECTION_STRING.

This means that we need just APPLICATIONINSIGHTS_CONNECTION_STRING.

Upvotes: 6

Björn Jarisch
Björn Jarisch

Reputation: 346

One important thing to note is that if APPINSIGHTS_INSTRUMENTATIONKEY is removed from the Azure Function's configuration, the "Logs" entry in the "Monitoring" section in the Azure portal does not show logs anymore and instead asks you again to connect to an Application Insights resource. If you do so, the portal recreates the APPINSIGHTS_INSTRUMENTATIONKEY config setting.

This seems like a bug in the Azure portal since metrics and logs do continue to be collected. Also, funny enough "Log stream" continues to work as well.

Upvotes: 8

Gaurav Mantri
Gaurav Mantri

Reputation: 136196

Looking at the release notes for SDK Version 2.0.12998:

App Insights configuration will use the APPLICATIONINSIGHTS_CONNECTION_STRING app setting if it is set (APPINSIGHTS_INSTRUMENTATIONKEY is the fallback and continues to work as-is).

Furthermore, if you read the documentation for App Insights Connection String, you will notice that when you use connection string, you can specify custom endpoints. This is not possible if you just specify the instrumentation key. In that case, SDK will connect to default endpoints.

Upvotes: 28

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