Then your service is offline until you fix it. For many services a completely acceptable thing to happen once in a blue moon

Most would probably get two servers with a simple failover strategy. But on the other hand servers rarely die. At the scale of a datacenter it happens often, but if you have like six of them, buy server grade stuff and replace them every 3-5 years chances you won't experience any hardware issues

if you cant risk this rarity then get a failover server with equal specs

maybe add another for good measure....if the biz insurance needs extreme HA then absolutely have multiple failover

my point is you arent doing extreme orchestration or routing

throw a cloudflare ddos protection too