Add zone-redundant HA diagram

Author: johndowns

articles/mysql/flexible-server/concepts-high-availability.md

@@ -27,6 +27,8 @@ When you deploy a server with zone-redundant high availability, Azure creates tw
 
 You can choose the availability zone for both the primary server and the standby replica. Placing the primary server and the standby server in the same zone reduces latency, whereas placing them in different zones helps you prepare for disaster recovery situations and zone-down scenarios.
 
+:::image type="content" source="media/concepts-high-availability/mysql-overview-zone-redundant-ha.png" alt-text="Diagram that shows the architecture for zone-redundant high-availability." lightbox="media/concepts-high-availability/mysql-overview-zone-redundant-ha":::
+
 The data and log files are hosted in [zone-redundant storage (ZRS)](/azure/storage/common/storage-redundancy#redundancy-in-the-primary-region). The standby server continuously reads and replays the log files from the primary server's storage account, which storage-level replication protects.
 
 If a failover occurs: