The link at the end of the following sentence (L154 in monitoring.adoc) resolves to the top-level of the AMQ Streams on OpenShift doc:

In addition, you can use Prometheus and Grafana to monitor the JMX metrics. For more information, see Introducing Metrics.

The correct target for the link should be:

https://access.redhat.com/documentation/en-us/red_hat_amq/7.7/html-single/deploying_and_upgrading_amq_streams_on_openshift/index#assembly-metrics-str