Merge pull request #2756 from segmentio/DOC-495

Added warning label on Google Analytics 4 Destination [DOC-495]

Author: stayseesong

src/connections/destinations/catalog/actions-google-analytics-4/index.md

@@ -9,6 +9,9 @@ id: 60ad61f9ff47a16b8fb7b5d9
 
 When you have Segment installed, you can use your existing tracking implementation to fulfill your data collection needs with Google Analytics 4. Segment will send your data server-side to [Google's Measurement Protocol API](https://developers.google.com/analytics/devguides/collection/protocol/ga4).
 
+> warning ""
+> You won't be able to see user data or realtime data in your Google Analytics 4 instance, as Google's API is [in beta](https://developers.google.com/analytics/devguides/collection/protocol/ga4/reference/limitations){:target="_blank"} and hasn't added session support. You can contact Google for more information.  
+
 > success ""
 > **Good to know**: This page is about the [Actions-framework](/docs/connections/destinations/actions/) Google Analytics 4 destination. There's also a page about the [non-Actions Google Universal Analytics destination](/docs/connections/destinations/catalog/google-analytics/). Both of these destinations receive data _from_ Segment.
 
@@ -98,7 +101,7 @@ The Google Analytics 4 [debug mode](https://support.google.com/analytics/answer/
 
 ### Mobile Data
 
-Google recommends use of their Firebase SDKs to send mobile data to Google Analytics 4. To assist in your implementation, Segment has a [Firebase destination](/docs/connections/destinations/catalog/firebase) available for mobile analytics. For more information on linking Google Analytics 4 properties to Firebase, see [Google Analytics 4 Firebase integration](https://support.google.com/analytics/answer/9289234?hl=en){:target="_blank"}. Segment's Google Analytics 4 destination is currently only compatible with web streams. 
+Google recommends use of their Firebase SDKs to send mobile data to Google Analytics 4. To assist in your implementation, Segment has a [Firebase destination](/docs/connections/destinations/catalog/firebase) available for mobile analytics. For more information on linking Google Analytics 4 properties to Firebase, see [Google Analytics 4 Firebase integration](https://support.google.com/analytics/answer/9289234?hl=en){:target="_blank"}. Segment's Google Analytics 4 destination is currently only compatible with web streams.
 
 ### User Metrics & Sessions