Add dotnet application insights package

[rajkumar-rangaraj]

Add dotnet application insights package to azure-application-insights/buildpack.toml

  [[metadata.dependencies]]
    id = "Microsoft.ApplicationInsights.AutoInstrumentation"
    name = "Azure Application Insights Dotnet Agent"
    sha256 = "placeholder"
    stacks = ["io.buildpacks.stacks.bionic", "io.paketo.stacks.tiny", "*"]
    uri = "https://www.nuget.org/api/v2/package/Microsoft.ApplicationInsights.AutoInstrumentation/2.8.42-beta1"
    version = "2.8.42-beta1"

    [[metadata.dependencies.licenses]]
      type = "MIT"
      uri = "https://github.com/microsoft/ApplicationInsights-dotnet/blob/develop/LICENSE"

Enable auto-instrumentation for .NET Core

Following are the steps to download and enable Application Insights Auto-Instrumentation.

• Download the latest version Microsoft.ApplicationInsights.DotnetCoreAgent NuGet package
• Rename Microsoft.ApplicationInsights.DotnetCoreAgent2.8.*.nupkg to Microsoft.ApplicationInsights.DotnetCoreAgent2.8.*.zip
• Extract the content. e.g. To directory /tmp
• Set following environment variables in your .NET Core app.

  DOTNET_STARTUP_HOOKS=/tmp/core/StartupHook/Microsoft.ApplicationInsights.StartupHook.dll
  ASPNETCORE_HOSTINGSTARTUPASSEMBLIES=Microsoft.ApplicationInsights.StartupBootstrapper
  APPLICATIONINSIGHTS_CONNECTION_STRING=<Your Connection String>

• Run the app and verify telemetry flowing to your Application Insights resource