title: How to make this query using Prometheus?
body: <p>I'm really new to Prometheus and for the moment I want to do some tests with the query to be a bit more familiar with it.</p>
  
  <p>So with the query <code>container_last_seen[10s]</code>  it returns me an array :</p>
  
  <pre><code>container_last_seen{container_label_com_docker_compose_config_hash="dc8a2ab1347ad16ab37ff0ad03f3a00f86b381ea2d85d45a11367331526c3640",container_label_com_docker_compose_container_number="1",container_label_com_docker_compose_oneoff="False",container_label_com_docker_compose_project="dockprom",container_label_com_docker_compose_service="cadvisor",container_label_com_docker_compose_version="1.10.0",container_label_org_label_schema_group="monitoring",id="/docker/2b448d19a33b50411941a55435b03f5a4af19e3b3e9581054a67e4da3363ef19",image="google/cadvisor:v0.24.1",instance="cadvisor:8080",job="cadvisor",name="cadvisor"}  
  </code></pre>
  
  <p>And I want to get only the attribute <code>name</code>.<br>
  So my idea was to do something like this:  </p>
  
  <pre><code>container_last_seen[10s][name]
  </code></pre>
  
  <p>But I have a parse error. So how can I make this query ? </p>