Add a separate Sample Count plot at the bottom.

Also added sampleCount() to Evolution.

new-pipeline/evo.html

@@ -69,6 +69,10 @@ <h2 id="submissions-title" style="font-size: 18px; margin-bottom: 0"></h2>
                 <figure class="col-md-12">
                     <div class="col-md-12" id="submissions"></div>
                 </figure>
+                <h2 id="sample-counts-title" style="font-size: 18px; margin-bottom: 0"></h2>
+                <figure class="col-md-12">
+                    <div class="col-md-12" id="sample-counts"></div>
+                </figure>
             </div>
         </div>
         <div class="row">

new-pipeline/src/evo.js

@@ -33,6 +33,9 @@ var gMetaAggregates = [
   ["submissions", "Submissions", function (evolution) {
     return evolution.submissions();
   }, "#submissions"],
+  ["sample-count", "Sample count", function (evolution) {
+    return evolution.sampleCounts();
+  }, "#sample-counts"],
 ];
 var gAvailablaAggregates = gDefaultAggregates.concat(gMetaAggregates);
 
@@ -331,9 +334,8 @@ $(function () {
                   .show();
               }
 
-              $("#submissions-title")
-                .text($("#measure")
-                  .val() + " submissions");
+              $("#submissions-title").text($("#measure").val() + " submissions");
+              $("#sample-counts-title").text($("#measure").val() + " sample counts");
               $("#measure-description")
                 .text(evolutionDescription === null ? $(
                     "#measure")

v2/doc.md

@@ -199,6 +199,12 @@ Returns a list of submission counts for each histogram in `someEvolutionInstance
 
 This is provided as a convenience method to make it easy to plot summary statistics for histogram evolutions.
 
+### `someEvolutionInstance.sampleCounts()`
+
+Returns a list of sample counts for each histogram in `someEvolutionInstance`, sorted by date (oldest to newest).
+
+This is provided as a convenience method to make it easy to plot summary statistics for histogram evolutions.
+
 ### `Telemetry.Histogram`
 
 Class used to represent a histogram. Instances of this class can be obtained from `someEvolutionInstance.histogram()`. This class should not be instantiated directly.

v2/telemetry.js

@@ -312,6 +312,10 @@
       });
     };
 
+    Evolution.prototype.sampleCounts = function () {
+      return this.map(histogram => histogram.count);
+    };
+
     return Evolution;
   })();