Concurrent manager/request behavior with RAC database

Hi All-

We have recently migrated onto a new 2-node RAC configuration for our EBS instance (coming from a single-node). We are on version 12.2.9. The database is a single PDB, within a CDB, running on 19c (and Linux 7). And, the application tier is 2-nodes also.

We are still learning the about RAC as it relates to EBS. But, one thing that happened recently was that one of the RAC nodes went down, unexpectedly. This caused some issues for us, which we have been checking on since. As a result, we did update our context file value(s) for s_apps_jdbc_connect_descriptor to use the SCAN listener/values, as opposed to the hostname (we had app tier node 1 pointing to RAC node 1 and vice-versa ...).