Merge pull request #11171 from openshift-cherrypick-robot/cherry-pick-5129-to-enterprise-3.9

[enterprise-3.9] Update Cassandra docs link

Author: vikram-redhat

install_config/cluster_metrics.adoc

@@ -268,7 +268,7 @@ metrics data, if `USE_PERSISTANT_STORAGE=true` is set during the metrics set up
 process, `PV` will be on top in the network storage, with NFS as the default.
 However, using network storage in combination with Cassandra is not recommended,
 as per the
-link:http://docs.datastax.com/en/archived/cassandra/1.2/cassandra/architecture/architecturePlanningAntiPatterns_c.html[Cassandra
+link:http://docs.datastax.com/en/landing_page/doc/landing_page/planning/planningAntiPatterns.html#planningAntiPatterns__AntiPatNAS[Cassandra
 documentation].
 ====