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No secondary DNS configured?

As I already wrote, their server does not turn off, uptime is not interrupted, but the server simply stops working. Look at the CPU and RAM load status. By these parameters you can see abnormal server

Is anyone using the DNSSEC feature of Bunny DNS? Has it been reliable for you?

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Absolutely. I have 7 haproxy frontends pointing to 4 web mirrors and 5 webapp back-ends. Of these, 3 are "live" at any time, in that they have DNS records pointing at them, which are

Why not have multiple providers with a DNS fail over?

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publicly available dns resolver. Like written before rate limited and plain dns is disabled.

2M queries per month?

11M mixed (primary plain DNS w/ some DoH) queries ~ 3.5GB monthly

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What's your monthly DNS query for this instance?

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but no strange behaviour in can find any logs, no higher dns requests, ...

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