We run AMQ Broker operator with cluster-scoped installation, so the operator watches all namespaces. If we create ActiveMQArtemis CRs in two different namespaces having the same "name" and a different "adminUser/adminPassword" the password from the other namespace is being tried by the operator to connect to the broker. This causes many login warning in the broker Pods.

Step to reproduce:
Install AMQ Broker operator cluster-scoped, then create an ActiveMQArtemis CR in two different namespaces. Restart operator Pod, then create ActiveMQArtemisAddress CRs.

$ oc new-project myproject1
$ oc new-project myproject2

$ oc apply -f -<<EOF
apiVersion: broker.amq.io/v1beta1
kind: ActiveMQArtemis
metadata:
name: amq
namespace: myproject1
spec:
deploymentPlan:
size: 1
persistenceEnabled: false
requireLogin: true
resources:
limits:
cpu: 1000m
memory: 1Gi
requests:
cpu: 10m
memory: 50Mi
journalType: nio
jolokiaAgentEnabled: false
image: placeholder
adminUser: admin1
adminPassword: admin1
EOF

$ oc apply -f -<<EOF
apiVersion: broker.amq.io/v1beta1
kind: ActiveMQArtemis
metadata:
name: amq
namespace: myproject2
spec:
deploymentPlan:
size: 1
persistenceEnabled: false
requireLogin: true
resources:
limits:
cpu: 1000m
memory: 1Gi
requests:
cpu: 10m
memory: 50Mi
journalType: nio
jolokiaAgentEnabled: false
image: placeholder
adminUser: admin2
adminPassword: admin2
EOF

1. Restart operator
   $ oc delete pod -n openshift-operators --all

$ oc apply -f -<<EOF
apiVersion: broker.amq.io/v1beta1
kind: ActiveMQArtemisAddress
metadata:
name: myaddress-11
namespace: myproject1
spec:
addressName: myAddress11
queueName: myQueue11
routingType: anycast
EOF

$ oc apply -f -<<EOF
apiVersion: broker.amq.io/v1beta1
kind: ActiveMQArtemisAddress
metadata:
name: myaddress-21
namespace: myproject2
spec:
addressName: myAddress21
queueName: myQueue21
routingType: anycast
EOF

In broker Pod we see login warnings:
$ oc logs amq-ss-0 -n myproject1
WARN

: Login failed due to: User does not exist: admin2

$ oc logs amq-ss-0 -n myproject1
WARN

: Login failed due to: User does not exist: admin1

Note: One known workaround to use different "name" for ActiveMQArtemis CRs globally