Fallback to poller replication lag if heartbeat lag fails #207

ejortegau merged 5 commits intoslack-vitess-r14.0.5slackhq/vitess:slack-vitess-r14.0.5from

ejortegau/simultaneous_heartbeat_poller_replication_trackerslackhq/vitess:ejortegau/simultaneous_heartbeat_poller_replication_trackerCopy head branch name to clipboard