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[Proxy/Client] Fix DNS server denial-of-service issue when DNS entry …
…expires (#15403) - DnsNameResolver doesn't coordinate concurrency and this leads to DNS server DoS under high load - In Netty, DnsAddressResolverGroup internally uses internal InflightNameResolver class to address the problem - The solution is to use DnsAddressResolverGroup instead of instantiating DnsNameResolver directly
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