With the next release of kuadrant v1..2.0 were adding a new kustomize file for installing observability on openshift -> https://issues.redhat.com/browse/CONNLINK-548
Once this merges the doc here will need updating.Specifically step 2 in the procedure will need to be updated to use the new file added in this PR https://github.com/Kuadrant/kuadrant-operator/pull/1590/files so it should be 

• if kuadrant operator iis nstalled in a custom namespace. (we need to add YQ as a prereq for this step)

CUSTOM_NAMESPACE=YOUR_CUSTOM_NS 

kubectl kustomize config/install/configure/observability/openshift | \ yq '(select(.kind == "ServiceMonitor" and .metadata.namespace == "openshift-operators") | .metadata.namespace) = env(CUSTOM_NAMESPACE)' | \ kubectl apply -f -

•  if kuadrant operator is installed in the default 'openshift-operators' namespce then the command bellow can be used

kubectl apply -k https://github.com/Kuadrant/kuadrant-operator/config/install/configure/observability/openshift