docs: Added documentation and cross-link for Azure site extension

Signed-off-by: mrickard <[email protected]>

src/content/docs/apm/agents/nodejs-agent/getting-started/monitor-your-nodejs-app.mdx

@@ -51,6 +51,14 @@ We have a few paths to install the Node.js agent, depending on what you're monit
 
     If you have a preference for manual installation via the command line, we currently have the option for [Legacy instrumentation for Lambda monitoring](/docs/serverless-function-monitoring/aws-lambda-monitoring/enable-lambda-monitoring/enable-serverless-monitoring-aws-lambda-legacy/#node).
   </Collapser>
+
+  <Collapser
+      id="azure"
+      title="Azure web app on Windows"
+  >
+    If you'd like to instrument an Azure Web App (provided that it's on Windows and deployed as code), you can easily install and configure the New Relic Node Agent with the [Azure Node Agent Site Extension](/docs/apm/agents/nodejs-agent/installation-configuration/install-nodejs-agent-azure-site-extension).
+
+  </Collapser>
 </CollapserGroup>
 
 ## What's next? [#next]

src/content/docs/apm/agents/nodejs-agent/installation-configuration/install-nodejs-agent-azure-site-extension.mdx

@@ -0,0 +1,57 @@
+---
+title: Install the Node.js agent with our Azure site extension
+tags:
+  - Agents
+  - Nodejs agent
+  - Installation and configuration
+  - Azure Site Extension
+translate:
+  - jp
+  - kr
+metaDescription: Procedures and resources to install New Relic's Node.js agent for Azure web apps using the New Relic Azure Site Extension for Node.
+freshnessValidatedDate: never
+---
+
+  <Callout variant="important">
+    Azure Site Extensions are available only for Windows-based App Service apps deployed as Code.
+  </Callout>
+
+g the site extension will install the New Relic Node agent.
+
+From the Azure Home page, do the following:
+- Click the App Services tile
+- Click the name of the target application in the displayed list
+- On the options listed on the left, scroll down to "Extensions" located under the Development Tools category
+- Click on + Add at the top of the page
+- From the extension drop down, select New Relic Node Agent.
+- Check the box for accepting the legal terms
+- Click Add on the bottom of the page. This will begin installation of the extension.
+
+Once installed, the extension creates the following artifacts:
+
+- Folder: `C:\home\SiteExtensions\NewRelic.Azure.Websites.Extension.NodeAgent`
+- XDT: `applicationHost.xdt` that will add the necessary `NODE_OPTIONS` environment variable on application startup
+- The New Relic Node agent and dependencies will be installed into `C:\home\site\wwwroot\node_modules`
+
+If the extension fails to install, a log file is created at `C:\home\SiteExtensions\NewRelic.Azure.Websites.Extension.NodeAgent\install.log`.
+
+If the New Relic agent has been installed successfully and logging has been enabled, the agent will append its logs to a file at `C:\home\site\wwwroot\newrelic_agent.log`.
+
+### Compatibility note:
+
+For applications running on Win 32, full Code Level Metrics support (file path, line, column) is not available, and profiling will fall back to function name only.
+
+## Configuration
+The New Relic Node agent is configured with the `newrelic.js` file, or via environment variables. [See our documentation for more detailed configuration](https://docs.newrelic.com/docs/apm/agents/nodejs-agent/installation-configuration/nodejs-agent-configuration/).
+
+Once the site extension is installed, you'll need to manually enter one configuration item before restarting your application.
+  - On the options listed on the left, scroll down to "Environment variables" located under the "Settings" category and add the following:
+    - `NEW_RELIC_LICENSE_KEY` - Your New Relic license key value
+
+The Node agent automatically adds the `NODE_OPTIONS` environment variable with a value of `-r newrelic` which starts the agent.
+  - Note: Any previously `NODE_OPTIONS` will be removed and reset with `-r newrelic`.
+
+  <Callout variant="important">
+    We recommend installing or removing this Azure site extension while your web application is stopped.
+  </Callout>
+