diff --git a/packages/kbn-analytics/src/report.ts b/packages/kbn-analytics/src/report.ts
index 1c0b37966355fb..16c0a3069e5fdb 100644
--- a/packages/kbn-analytics/src/report.ts
+++ b/packages/kbn-analytics/src/report.ts
@@ -78,6 +78,7 @@ export class ReportManager {
   }
   assignReports(newMetrics: Metric | Metric[]) {
     wrapArray(newMetrics).forEach(newMetric => this.assignReport(this.report, newMetric));
+    return { report: this.report };
   }
   static createMetricKey(metric: Metric): string {
     switch (metric.type) {
@@ -101,7 +102,7 @@ export class ReportManager {
       case METRIC_TYPE.USER_AGENT: {
         const { appName, type, userAgent } = metric;
         if (userAgent) {
-          this.report.userAgent = {
+          report.userAgent = {
             [key]: {
               key,
               appName,
@@ -110,23 +111,22 @@ export class ReportManager {
             },
           };
         }
+
         return;
       }
       case METRIC_TYPE.CLICK:
       case METRIC_TYPE.LOADED:
       case METRIC_TYPE.COUNT: {
         const { appName, type, eventName, count } = metric;
-        if (report.uiStatsMetrics) {
-          const existingStats = (report.uiStatsMetrics[key] || {}).stats;
-          this.report.uiStatsMetrics = this.report.uiStatsMetrics || {};
-          this.report.uiStatsMetrics[key] = {
-            key,
-            appName,
-            eventName,
-            type,
-            stats: this.incrementStats(count, existingStats),
-          };
-        }
+        report.uiStatsMetrics = report.uiStatsMetrics || {};
+        const existingStats = (report.uiStatsMetrics[key] || {}).stats;
+        report.uiStatsMetrics[key] = {
+          key,
+          appName,
+          eventName,
+          type,
+          stats: this.incrementStats(count, existingStats),
+        };
         return;
       }
       default:
diff --git a/test/api_integration/apis/ui_metric/ui_metric.js b/test/api_integration/apis/ui_metric/ui_metric.js
index 5b02ba7e72430f..5ddbd8649589c7 100644
--- a/test/api_integration/apis/ui_metric/ui_metric.js
+++ b/test/api_integration/apis/ui_metric/ui_metric.js
@@ -25,15 +25,13 @@ export default function({ getService }) {
   const es = getService('legacyEs');
 
   const createStatsMetric = eventName => ({
-    key: ReportManager.createMetricKey({ appName: 'myApp', type: METRIC_TYPE.CLICK, eventName }),
     eventName,
     appName: 'myApp',
     type: METRIC_TYPE.CLICK,
-    stats: { sum: 1, avg: 1, min: 1, max: 1 },
+    count: 1,
   });
 
   const createUserAgentMetric = appName => ({
-    key: ReportManager.createMetricKey({ appName, type: METRIC_TYPE.USER_AGENT }),
     appName,
     type: METRIC_TYPE.USER_AGENT,
     userAgent:
@@ -42,12 +40,9 @@ export default function({ getService }) {
 
   describe('ui_metric API', () => {
     it('increments the count field in the document defined by the {app}/{action_type} path', async () => {
+      const reportManager = new ReportManager();
       const uiStatsMetric = createStatsMetric('myEvent');
-      const report = {
-        uiStatsMetrics: {
-          [uiStatsMetric.key]: uiStatsMetric,
-        },
-      };
+      const { report } = reportManager.assignReports([uiStatsMetric]);
       await supertest
         .post('/api/ui_metric/report')
         .set('kbn-xsrf', 'kibana')
@@ -61,21 +56,18 @@ export default function({ getService }) {
     });
 
     it('supports multiple events', async () => {
+      const reportManager = new ReportManager();
       const userAgentMetric = createUserAgentMetric('kibana');
       const uiStatsMetric1 = createStatsMetric('myEvent');
       const hrTime = process.hrtime();
       const nano = hrTime[0] * 1000000000 + hrTime[1];
       const uniqueEventName = `myEvent${nano}`;
       const uiStatsMetric2 = createStatsMetric(uniqueEventName);
-      const report = {
-        userAgent: {
-          [userAgentMetric.key]: userAgentMetric,
-        },
-        uiStatsMetrics: {
-          [uiStatsMetric1.key]: uiStatsMetric1,
-          [uiStatsMetric2.key]: uiStatsMetric2,
-        },
-      };
+      const { report } = reportManager.assignReports([
+        userAgentMetric,
+        uiStatsMetric1,
+        uiStatsMetric2,
+      ]);
       await supertest
         .post('/api/ui_metric/report')
         .set('kbn-xsrf', 'kibana')