message: dns cache: add missing logs
diff: @@ -205,9 +205,13 @@ void DnsCacheImpl::finishResolve(const std::string& host,
  if (status == Network::DnsResolver::ResolutionStatus::Success) {
  failure_backoff_strategy_->reset();
  primary_host_info.refresh_timer_->enableTimer(refresh_interval_);
  + ENVOY_LOG(debug, "DNS refresh rate reset for host '{}', refresh rate {} ms", host,
  + refresh_interval_.count());
  } else {
  - primary_host_info.refresh_timer_->enableTimer(
  - std::chrono::milliseconds(failure_backoff_strategy_->nextBackOffMs()));
  + const uint64_t refresh_interval = failure_backoff_strategy_->nextBackOffMs();
  + primary_host_info.refresh_timer_->enableTimer(std::chrono::milliseconds(refresh_interval));
  + ENVOY_LOG(debug, "DNS refresh rate reset for host '{}', (failure) refresh rate {} ms", host,
  + refresh_interval);
  }
  }
  