public long dnsResolutionStartTimeMillis() {
        return toMillis(dnsResolutionStartTimeMicros);
    }
Returns the time when the client started to resolve a domain name, in milliseconds since the epoch.

@return the start time, or {@code -1} if there was no action to resolve a domain name.
core/src/main/java/com/linecorp/armeria/common/logging/ClientConnectionTimings.java