Needs a [2020], but that suggests the author may well have an answer by now to their hypothetical question 'how do you propose to upgrade the cluster?'. Like a

Needs a [2020], but that suggests the author may well have an answer by now to their hypothetical question 'how do you propose to upgrade the cluster?'. Like a lot of highly complex Cool Tools they're marvellous right up until you hit an edge case or performance threshold or an odd failure state -- and then you find yourself copy-pasting increasingly trimmed-down log entries, desperately seeking people who've hit the same problem, or rather, people who've solved the same problem and thought to describe it on the Internet. If you're on fresh software, a fresh version, or just doing something mildly off-label, this can be a despairing process.