title: How to execute multiple queries in one call in Prometheus
body: <p>I'm running prometheus inside kubernetes cluster. </p>
  
  <p>I need to send queries to Prometheus every minute, to gather information of many metrics from many containers. There are too match queries, so I must combine them.</p>
  
  <p>I know how I can ask Prometheus for one metric information on multiple containers: <code>my_metric{container_name=~"frontend|backend|db"}</code> , but I haven't found a way to ask Prometheus for multiple metric information in one query.</p>
  
  <p>I'm looking for the equivalent to 'union' in sql queries.</p>