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This used to have a global limit, but that has a problem when using different servers for different upstream domains. Queries which are routed by domain to an upstream server which is not responding will build up and trigger the limit, which breaks DNS service for all other domains which could be handled by other servers. The change is to make the limit per server-group, where a server group is the set of servers configured for a particular domain. In the common case, where only default servers are declared, there is no effective change.