Merge branch 'jarv/check-all-secondaries' into 'master'

Will check replication status on all secondaries as well.

Closes #764

See merge request gitlab-com/migration!200

bin/scripts/02_failover/060_go/p03/check-wal-secondary-sync.sh

@@ -13,3 +13,10 @@ fi
 last_event=$(ssh "$POSTGRESQL_GCP_WAL_SECONDARY" 'sudo gitlab-psql -t -d gitlabhq_production -c "SELECT now() - pg_last_xact_replay_timestamp();"')
 
 echo "Last event seen for $POSTGRESQL_GCP_WAL_SECONDARY was${last_event} ago."
+
+echo "-----"
+for secondary in ${POSTGRESQL_GCP_SECONDARIES[*]}
+do
+    last_event=$(ssh "$secondary" 'sudo gitlab-psql -t -d gitlabhq_production -c "SELECT now() - pg_last_xact_replay_timestamp();"')
+    echo "Last event seen for $secondary was${last_event} ago."
+done