title: Micrometer - Add default prefix in metric name
body: <p>In micrometer, we can create a new gauge doing something like</p>
  
  <pre><code>myMeterRegistry.gauge("my_metric", 69);
  </code></pre>
  
  <p>See the code here <a href="https://github.com/micrometer-metrics/micrometer/blob/master/micrometer-core/src/main/java/io/micrometer/core/instrument/MeterRegistry.java#L468" rel="noreferrer">https://github.com/micrometer-metrics/micrometer/blob/master/micrometer-core/src/main/java/io/micrometer/core/instrument/MeterRegistry.java#L468</a></p>
  
  <p>Would be possible to include a "prefix" name by default for my <code>myMeterRegistry</code> object?</p>
  
  <p>Manually, it should like:</p>
  
  <pre><code>myeterRegistry.gauge("myprefix_my_metric", 69);
  </code></pre>
  
  <p>My goal is that every developer that creates a gauge metric in my application does not have to take care of adding the "myprefix_" at the beginning of the metric name</p>