title: Prometheus cpu seconds to percentage
body: <p>I would like to set an alert in prometheus when the usage of cpu is > 85%.</p>
  
  <p>My host exposes this metrics. </p>
  
  <pre><code>process_cpu_seconds_total[5m])
  </code></pre>
  
  <p>How can I convert it into percentage cpu usage?</p>