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If an error arises while using the parameter value monitoring.dedicated=true, note that both Prometheus and Grafana are installed from the kube-prometheus-stack Helm chart.

So, if there no error while installing HiveMQ Operator with monitoring.dedicated=false, but there is an error while installing HiveMQ Operator with monitoring.dedicated=true, this error originates from the kube-prometheus-stack Helm chart and not from the HiveMQ Operator Helm chart.
Such an error should be reported to the issues of the https://github.com/prometheus-community/helm-charts/issues rather than the HiveMQ Operator itself.