Operator :  amq online 1.7.3

Not working Expr:
I can see the below expr in promehtous rule `enmasse` yaml:
$ oc get prometheusrule enmasse -o yaml
~~~

expr: enmasse_artemis_address_memory_usage / on (brokerprefix) group_left enmasse_address_space_broker_global_max_size*100

~~~

Error:
~~~
Danger alert:An error occurred
found duplicate series for the match group {} on the right hand-side of the operation: [\{__name__="enmasse_address_space_broker_global_max_size", address_space_infra_uuid="standardevelopment", address_space_name="standard-ar-development", broker_prefix="broker-standardevelopment", container="address-space-controller", endpoint="health", exported_namespace="ar-development", instance="172.xx.xx.10:8080", job="address-space-controller", namespace="amq-online-infra", pod="address-space-controller-6xxxd-xxx", prometheus="openshift-user-workload-monitoring/user-workload", service="address-space-controller"}, \{__name__="enmasse_address_space_broker_global_max_size", address_space_infra_uuid="standaracceptance", address_space_name="standard-ar-acceptance", broker_prefix="broker-standaracceptance", container="address-space-controller", endpoint="health", exported_namespace="ar-acceptance", instance="172.xx.xx.10:8080", job="address-space-controller", namespace="amq-online-infra", pod="address-space-controller-6xxxd-xxx", prometheus="openshift-user-workload-monitoring/user-workload", service="address-space-controller"}];many-to-many matching not allowed: matching labels must be unique on one side

~~~

Working Expr:
enmasse_artemis_address_memory_usage / on (broker_prefix) group_left enmasse_address_space_broker_global_max_size * 100

Workaround: changed from brokerprefix -> broker_prefix , expr worked.