title: Loki display log message and extra fields separately
body: <p>In <a href="https://github.com/grafana/loki/issues/4249" rel="noreferrer">https://github.com/grafana/loki/issues/4249</a> I found interesting screenshot.
  <a href="https://i.stack.imgur.com/37uSz.png" rel="noreferrer"><img src="https://i.stack.imgur.com/37uSz.png" alt="enter image description here" /></a></p>
  <p>On this screenshot I see that log level and message are displayed bold with white text and other metadata (collected from log message) displayed on separate line with grey color.</p>
  <p>I have searched docs and haven't found how it's possible to achieve that. To be honest I'm searching for something like &quot;short message&quot; in ELK to make developers see metadata only when they are actually needs it.
  Could you please point me to the doc how to achieve that please?</p>