title: Prometheus - Match all metrics but one
body: <p>How can I match all Prometheus metrics except some?</p>
  
  <p>E.g: <code>{__name__!~"metric_to_discard"}</code></p>
  
  <p>Does not work, it returns <code>Error executing query: parse error at char 35: vector selector must contain at least one non-empty matcher</code>.</p>
  
  <p>Thanks</p>