diff --git a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.html b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.html
index 05dfbcf..3f5f64f 100644
--- a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.html
+++ b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.html
@@ -15,6 +15,7 @@
 -->
 
 <link rel="import" href="../../../bower_components/polymer/polymer.html">
+<link rel="import" href="../../core/gr-reporting/gr-reporting.html">
 <link rel="import" href="../../shared/gr-button/gr-button.html">
 <link rel="import" href="../gr-message/gr-message.html">
 
@@ -96,6 +97,7 @@
           on-scroll-to="_handleScrollTo"
           data-message-id$="[[message.id]]"></gr-message>
     </template>
+    <gr-reporting id="reporting" category="message-list"></gr-reporting>
   </template>
   <script src="gr-messages-list.js"></script>
 </dom-module>
diff --git a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js
index 774d1d2..543441a 100644
--- a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js
+++ b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js
@@ -17,6 +17,11 @@
   var MAX_INITIAL_SHOWN_MESSAGES = 20;
   var MESSAGES_INCREMENT = 5;
 
+  var ReportingEvent = {
+    SHOW_ALL: 'show-all-messages',
+    SHOW_MORE: 'show-more-messages',
+  };
+
   Polymer({
     is: 'gr-messages-list',
 
@@ -272,6 +277,7 @@
 
     _handleShowAllTap: function() {
       this._visibleMessages = this._processedMessages;
+      this.$.reporting.reportInteraction(ReportingEvent.SHOW_ALL);
     },
 
     _handleIncrementShownMessages: function() {
@@ -281,6 +287,7 @@
       var newMessages = this._processedMessages.slice(-(len + delta), -len);
       // Add newMessages to the beginning of _visibleMessages
       this.splice.apply(this, ['_visibleMessages', 0, 0].concat(newMessages));
+      this.$.reporting.reportInteraction(ReportingEvent.SHOW_MORE);
     },
 
     _processedMessagesChanged: function(messages) {
diff --git a/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js b/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
index 7d9fda4..d4cd1e1 100644
--- a/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
+++ b/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
@@ -35,6 +35,8 @@
     CATEGORY: 'exception',
   };
 
+  var INTERACTION_TYPE = 'interaction';
+
   var CHANGE_VIEW_REGEX = /^\/c\/\d+\/?\d*$/;
   var DIFF_VIEW_REGEX = /^\/c\/\d+\/\d+\/.+$/;
 
@@ -69,6 +71,8 @@
     is: 'gr-reporting',
 
     properties: {
+      category: String,
+
       _baselines: {
         type: Array,
         value: function() { return {}; },
@@ -100,7 +104,8 @@
       if (type === ERROR.TYPE) {
         console.error(eventValue.error || eventName);
       } else {
-        console.log(eventName + ': ' + eventValue);
+        console.log(eventName + (eventValue !== undefined ?
+            (': ' + eventValue) : ''));
       }
     },
 
@@ -186,6 +191,10 @@
       this.reporter(TIMING.TYPE, TIMING.CATEGORY, name, time);
       delete this._baselines[name];
     },
+
+    reportInteraction: function(eventName) {
+      this.reporter(INTERACTION_TYPE, this.category, eventName);
+    },
   });
 
   window.GrReporting = GrReporting;