Add notes and links for alternatives to deprecated addons (openshift-service-mesh#181)

Signed-off-by: Nick Fox <[email protected]>

Author: nrfox

docs/ossm/ossm2-migration/README.md

@@ -13,10 +13,10 @@ Before you begin to migrate your controlplane from OpenShift Service Mesh 2.6 to
     <!-- TODO: revisit this list when: https://issues.redhat.com/browse/OSSM-8299 is completed. -->
   - Network Policy management: `spec.security.manageNetworkPolicy=false`. If you wish to keep the Network Policies created by the 2.6 `ServiceMeshControlPlane`, you will need to recreate and manage these manually.
   - Disabled addons:
-    - Prometheus: `spec.addons.prometheus.enabled=false`
-    - Kiali: `spec.addons.kiali.enabled=false`
+    - Prometheus: `spec.addons.prometheus.enabled=false`. See [here](https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0.0tp1/html/observability/metrics-and-service-mesh#ossm-config-openshift-monitoring-only_ossm-metrics-assembly) for instructions on how to configure OpenShift Service Mesh 3.0 with OpenShift Monitoring as a replacement for the prometheus addon.
+    - Kiali: `spec.addons.kiali.enabled=false`. See [here](https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0.0tp1/html/observability/kiali-operator-provided-by-red-hat#ossm-install-kiali-operator_ossm-kiali-assembly) for instructions on how to install and configure Kiali with OpenShift Service Mesh 3.0 as a replacement for the Kiali addon.
     - Grafana: `spec.addons.grafana.enabled=false`
-    - Tracing: `spec.tracing.type=None`
+    - Tracing: `spec.tracing.type=None`. See [here](https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0.0tp1/html/observability/distributed-tracing-and-service-mesh#ossm-distr-tracing-assembly) for instructions on how to configure OpenShift Service Mesh 3.0 with OpenShift Distributed Tracing as a replacement for the tracing addon.
   - IOR is disabled.
   - Default ingress/egress gateways are disabled.