Correct metric type. (#10987)

This metric should be a DD distribution instead of a gauge since we want percentiles.

Author: davinchia

airbyte-metrics/lib/src/main/java/io/airbyte/metrics/lib/DogStatsDMetricSingleton.java

@@ -159,4 +159,16 @@ public static void recordTimeGlobal(final MetricsRegistry metric, final Runnable
     recordTimeGlobal(metric, val, tags);
   }
 
+  /**
+   * Wrapper around {@link #recordTimeGlobal(MetricsRegistry, double, String...)} with a different
+   * name to better represent what this function does.
+   *
+   * @param metric
+   * @param val
+   * @param tags
+   */
+  public static void percentile(final MetricsRegistry metric, final double val, final String... tags) {
+    recordTimeGlobal(metric, val, tags);
+  }
+
 }

airbyte-metrics/reporter/src/main/java/io/airbyte/metrics/reporter/ReporterApp.java

@@ -72,7 +72,7 @@ public static void main(final String[] args) throws IOException, InterruptedExce
       try {
         final var age = configDatabase.query(MetricQueries::numberOfActiveConnPerWorkspace);
         for (long count : age) {
-          DogStatsDMetricSingleton.gauge(MetricsRegistry.NUM_ACTIVE_CONN_PER_WORKSPACE, count);
+          DogStatsDMetricSingleton.percentile(MetricsRegistry.NUM_ACTIVE_CONN_PER_WORKSPACE, count);
         }
       } catch (final SQLException e) {
         e.printStackTrace();