Yes, especially if people use the “latest” tag, trusting whatever the container might be updated to do in the future.
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To explain how HAproxy and competing tools solve this:
Two servers are prepared to be the single reverse proxy, but one is active. They constantly communicate with a “heartbeat”. When the active one fails to send a heartbeat, the secondary executes the steps to become the active primary. When the primary’s heart starts beating again, it becomes active again.
So there can be a few seconds of downtime, but the failover is automatic.