Stop using ridiculously low DNS TTLs, now
https://00f.net/2019/11/03/stop-using-low-dns-ttls/
@jpmens For ftp.acc.umu.se we use 600s, because that's how long we can reasonably wait until we take a fronted down for maintenance. More than twice that isn't really feasible, at that point clients would just hit errors more often.
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