Mezmo change history: The Web UI is not accessible

Mezmo reported a critical Web App outage: the Web UI was inaccessible and returned “failure to get a peer from the ring-balancer.” The incident record started at 2023-05-01 20:18 UTC and was resolved at 2023-05-01 20:27 UTC, lasting 9 min; the postmortem lists a different outage window.