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highlight how an unexpected negative // value impacted their service in 2017 // See for details: // https://blog.cloudflare.com/how-and-why-the-leap-second-affected-cloudflare-dns/ if !start.IsZero() { rtt := time.Now().Sub(start) if success && rcode != dns.RcodeServerFailure { s.updateRTT(rtt) }