Hi @fmussoni,

All DO managed database clusters have automated failover, meaning they automatically detect and replace degraded or failing nodes.

In other for the failover to happen, The database cluster will have primary and standby nodes. The standby nodes maintain a copy of the primary node.

In the event of a failure, The standby node is immediately promoted to primary and begins serving requests while a replacement standby node is provisioned in the background.

For more information on high availability:

https://www.digitalocean.com/docs/databases/#high-availability
https://docs.digitalocean.com/products/databases/mysql/#plans-and-pricing

You can add standby nodes during cluster creation as well as to an existing database cluster.

The below link has information on how to add a standby node :
https://docs.digitalocean.com/products/databases/mysql/how-to/add-standby-nodes/

I hope this helps!

Regards,
Rajkishore