title: Adding 'mean', 'min' or 'percentiles' to Spring Boot 2 metrics?
body: <p>I am using the new <strong>MicroMeter</strong> metrics in <strong>Spring Boot 2</strong> version <code>2.0.0-RELEASE</code>.</p>
  
  <p>When publishing metrics over the <code>/actuator/metrics/{metric.name}</code> endpoint, i get the following:</p>
  
  <p>For a <code>DistributionSummary</code> :</p>
  
  <pre><code>"name": "sources.ingestion.rate",
      "measurements": [
          {
             "statistic": "COUNT",
              "value": 5
          },
          {
              "statistic": "TOTAL",
              "value": 72169.44162067816
          },
          {
              "statistic": "MAX",
              "value": 17870.68010661754
          }
      ],
      "availableTags": []
  }
  </code></pre>
  
  <p>For a <code>Timer</code> :</p>
  
  <pre><code>{
      "name": "sources.ingestion",
      "measurements": [
          {
              "statistic": "COUNT",
              "value": 5
          },
          {
              "statistic": "TOTAL_TIME",
              "value": 65.700878648
          },
          {
              "statistic": "MAX",
              "value": 22.661545322
          }
      ],
      "availableTags": []
  }
  </code></pre>
  
  <p>Is it possible to enrich the measurements to <strong>add measures</strong> like <em>mean</em>, <em>min</em>, or <em>percentiles</em> ?</p>
  
  <p>For percentiles i tried using <code>.publishPercentiles(0.5, 0.95)</code>, but that doesn't reflect on the actuator endpoint.</p>