doc: Add in documentation for how to bypass adblockers (#716)

Signed-off-by: Zack Wu <zack.wu@instacart.com>

docs/faq.md

@@ -44,4 +44,15 @@ config to your databuilder job's config
 ```
 
 This config means that databuilder will only update the table / column description if it doesn't exist before which could be the table is newly created.
-This is useful when we treat Amundsen graph as the source of truth for certain types of metadata (e.g description).
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+This is useful when we treat Amundsen graph as the source of truth for certain types of metadata (e.g description).
+
+## How to capture all Google Analytics?
+
+Users are likely to have some sort of adblocker installed, making your Google Analytics less accurate.
+
+To put a proxy in place to bypass any adblockers and capture all analytics, follow these steps:
+
+1. Follow https://github.com/ZitRos/save-analytics-from-content-blockers#setup to set up your own proxy server.
+2. In the same repository, run `npm run mask www.googletagmanager.com/gtag/js?id=UA-XXXXXXXXX` and save the output.
+3. In your custom frontend, override https://github.com/amundsen-io/amundsenfrontendlibrary/blob/master/amundsen_application/static/templates/fragments/google-analytics-loader.html#L6 to <script async src="https://my-proxy-domain/MASKEDGOOGLETAGAMANAGERURL"></script>
+4. Now, note that network requests to www.googletagmanager.com will be sent from behind your masked proxy endpoint, saving your analytics from content blockers!
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