open-consul/ui/packages/consul-ui/app/templates/dc/services/instance/upstreams.hbs

<div class="tab-section">
  <div role="tabpanel">
  {{#if (gt proxy.Service.Proxy.Upstreams.length 0)}}
    <Consul::UpstreamInstance::List @items={{proxy.Service.Proxy.Upstreams}} @dc={{dc}} @nspace={{nspace}} />
  {{/if}}
  </div>
</div>