Add Google tag first party mode

Author: angelampcosta

public/robots.txt

@@ -4,5 +4,6 @@ Disallow: /client-ip-geolocation
 Disallow: /plans/
 Disallow: /constellation
 Disallow: /cdn-cgi/
+Disallow: /google-tag-first-party-mode/
 
 Sitemap: https://developers.cloudflare.com/sitemap-index.xml

src/assets/images/google-tag-first-party-mode/google-tag-configuration.png

@@ -0,0 +1,31 @@
+---
+title: Google tag in first-party mode
+pcx_content_type: reference
+sidebar:
+  order: 1
+
+---
+
+## Get started
+
+Google tag in first-party mode allows website owners using Google Tag Manager and Cloudflare as a CDN to add a layer of data security and enables additional data privacy controls — such as full IP obfuscation — without compromising your measurement.
+
+At the moment, Google tag in first-party mode is in closed beta. You can sign up to participate in the closed beta through the Tag Manager module of Google Marketing Platform [link].
+
+### Configure Google tag in first-party mode in the dashboard
+
+1. Log in to the [Cloudflare dashboard](https://dash.cloudflare.com/login) and select your account.
+2. Go to Google tag in first-party mode > Configuration.
+3. Enable the toggle for Turn on and configure Google tag. 
+
+![Google tag in first-party mode configuration](~/assets/images/google-tag-first-party-mode/google-tag-configuration.png)
+
+4. Add your Google tag ID and the path on your website reserved for the Google tag. 
+The Google tag ID can be found in the Google Tag Experience dashboard. The measurement path is an unused path on your site that will load Google Tag Manager and all subsequent measurement requests.  
+
+![Add to ID and path](~/assets/images/google-tag-first-party-mode/google-tag-id-path.png)
+
+5. Once you click Save, Google Tag in First Party Mode will be enabled on your zone. If you already have a GTM script on your website, this First Party Tag will override the existing script.
+
+Now that you have authenticated into your Cloudflare account and configured GTM in first-party mode, your Google Tags will be loaded using `https://your-domain/measurement-path/...`and subsequent measurement requests will be proxied by Cloudflare.
+

src/assets/images/google-tag-first-party-mode/google-tag-id-path.png

@@ -0,0 +1,22 @@
+name: Google tag in first-party mode
+
+product:
+  title: Google tag in first-party mode
+  url: /google-tag-first-party-mode/
+  group: Performance
+  show: false
+
+meta:
+  title: Google tag in first-party mode docs
+  description:
+    Google tag in first-party mode allows website owners using Google Tag Manager and Cloudflare as a CDN to add a layer of data security and enables additional data privacy controls.
+  author: "@cloudflare"
+
+externals:
+  - title: Cloudflare home
+    url: https://www.cloudflare.com/
+
+algolia:
+  index: TEST - Re-dev docs
+  apikey: 4edb0a6cef3338ff4bcfbc6b3d2db56b
+  product: google-tag-first-party-mode