message: downgrade dns resolution logs to trace
diff: @@ -1328,14 +1328,14 @@ StrictDnsClusterImpl::ResolveTarget::~ResolveTarget() {
  }
  void StrictDnsClusterImpl::ResolveTarget::startResolve() {
  - ENVOY_LOG(debug, "starting async DNS resolution for {}", dns_address_);
  + ENVOY_LOG(trace, "starting async DNS resolution for {}", dns_address_);
  parent_.info_->stats().update_attempt_.inc();
  active_query_ = parent_.dns_resolver_->resolve(
  dns_address_, parent_.dns_lookup_family_,
  [this](const std::list<Network::Address::InstanceConstSharedPtr>&& address_list) -> void {
  active_query_ = nullptr;
  - ENVOY_LOG(debug, "async DNS resolution complete for {}", dns_address_);
  + ENVOY_LOG(trace, "async DNS resolution complete for {}", dns_address_);
  parent_.info_->stats().update_success_.inc();
  std::unordered_map<std::string, HostSharedPtr> updated_hosts;
  