MB opened per ns_server team's request:
https://issues.couchbase.com/browse/MB-38507?focusedCommentId=459216&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-459216
MB-41248 XDCR UI - Allow an easy way for users to see broken mappings
MB-38507 Post brokenMapping to replicationStatus for UI to digest
ErrorsList Design doc