Journalctl -u dnsmasq

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journalctl -r -u dnsmasq
May 08 22:33:27 SERVER dnsmasq[18982]: Maximum number of concurrent DNS queries reached (max: 150)

From man page:

-0, --dns-forward-max=<queries>
Set the maximum number of concurrent DNS queries. The default value is 150, which should be fine for most setups. The only known situation where this needs to be increased is when using web-server log file resolvers, which can generate large numbers of concurrent queries.
Aug 18 12:08:52 SERVER systemd-resolved[754]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP

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