Deploy basic broker with size 2:

apiVersion: broker.amq.io/v1beta1
kind: ActiveMQArtemis
metadata:
name: ex-aao
spec:
deploymentPlan:
size: 2
image: placeholder
persistenceEnabled: true
messageMigration: true

Sent 100 messages to both the brokers
Then applied the new yaml file with deployment size as 1
It shut down the second pod with but pod1 stayed with only 100 messages.