Added scale-to-seconds transformation

src/app/panels/histogram/editor.html

@@ -16,6 +16,9 @@
       <label class="small">Scale</label>
         <input type="text" class="input-mini" ng-model="panel.scale">
     </div>
+    <div class="editor-option">
+      <label class="small">Seconds <tip>Normalize intervals to per-second</tip></label><input type="checkbox" ng-model="panel.scaleSeconds" ng-checked="panel.scaleSeconds">
+    </div>
     <div class="editor-option">
       <label class="small">Derivative <tip>Plot the change per interval in the series</tip></label><input type="checkbox" ng-model="panel.derivative" ng-checked="panel.derivative" ng-change="set_refresh(true)">
     </div>

src/app/panels/histogram/module.html

@@ -51,7 +51,7 @@
         <span ng-show="panel.legend_counts"> ({{series.hits}})</span>
       </span>
     </span>
-    <span ng-show="panel.legend" class="small"><span ng-show="panel.derivative">change in </span><span class="strong" ng-show="panel.value_field && panel.mode != 'count'">{{panel.value_field}}</span> {{panel.mode}} per <strong>{{panel.interval}}</strong> | (<strong>{{hits}}</strong> hits)</span>
+    <span ng-show="panel.legend" class="small"><span ng-show="panel.derivative">change in </span><span class="strong" ng-show="panel.value_field && panel.mode != 'count'">{{panel.value_field}}</span> {{panel.mode}} per <strong ng-hide="panel.scaleSeconds">{{panel.interval}}</strong><strong ng-show="panel.scaleSeconds">1s</strong> | (<strong>{{hits}}</strong> hits)</span>
   </div>
   <form class="form-inline bordered histogram-options" ng-show="options">
     <span>

src/app/panels/histogram/module.js

@@ -438,6 +438,12 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
           });
         };
 
+        var scaleSeconds = function(series,interval) {
+          return _.map(series,function(p) {
+            return [p[0],p[1]/kbn.interval_to_seconds(interval)];
+          });
+        };
+
         var derivative = function(series) {
           return _.map(series, function(p,i) {
             var _v;
@@ -565,6 +571,9 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
               if(scope.panel.scale !== 1) {
                 _d = scale(_d,scope.panel.scale);
               }
+              if(scope.panel.scaleSeconds) {
+                _d = scaleSeconds(_d,scope.panel.interval);
+              }
               scope.data[i].data = _d;
             }