...

After the deleted instance has terminated the 3 instances are all running normally.

  During this time there was no issues with the Portal Website.

TODO: In the following releases, the portal-db, portal-widget needs to be tested with similar resiliency and scaling tests. The portal-cassandra and portal-zookeeper requires coordination with MUSIC team to test the resiliency as there are some plans to provide MUSIC as a service. 

Sanity Tests 

Check Portal UI and perform sanity tests.

...