Create documentation about using ApplicationHost.config to configure per-app pool environment variables

[JcolemanNR]

Feature Description

It is possible to add per-app pool environment variables by modifying:
C:\Windows\System32\inetsrv\config\ApplicationHost.config

There is no internal or customer-facing documentation about how to do this, but it would be valuable for customers and developers to know about as an option to enable/disable the .NET agent, and agent options.

Example:

<applicationPools>
    <add name="DefaultAppPool" />
    <add name="Classic .NET AppPool" managedRuntimeVersion="v2.0" managedPipelineMode="Classic" />
    <add name=".NET v2.0 Classic" managedRuntimeVersion="v2.0" managedPipelineMode="Classic" />
    <add name=".NET v2.0" managedRuntimeVersion="v2.0" />
    <add name=".NET v4.5 Classic" managedRuntimeVersion="v4.0" managedPipelineMode="Classic" />
    <add name=".NET v4.5" managedRuntimeVersion="v4.0" />
    <add name="TestApplication" autoStart="true" managedRuntimeVersion="v4.0">
        <environmentVariables>
            <add name="COR_ENABLE_PROFILING" value="1" />
            <add name="NEW_RELIC_LICENSE_KEY" value="xxxxxxxx" />
            <add name="NEW_RELIC_APP_NAME" value="Log4NetFrameworkTestApp" />
            <add name="NEWRELIC_LOG_LEVEL" value="debug" />
            <add name="NEW_RELIC_APPLICATION_LOGGING_FORWARDING_ENABLED" value="true" />
        </environmentVariables>
    </add>
    <applicationPoolDefaults managedRuntimeVersion="v4.0">
        <processModel identityType="ApplicationPoolIdentity" loadUserProfile="true" setProfileEnvironment="false" />
    </applicationPoolDefaults>
</applicationPools>

For Maintainers Only or Hero Triaging this bug
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[workato-integration]

https://issues.newrelic.com/browse/NEWRELIC-3678