feat: Display how many conversations are considered for the metric calculation (#4273)

* feat: Display how many conversations are considered for the metric calculation

app/javascript/dashboard/mixins/reportMixin.js

@@ -5,6 +5,7 @@ export default {
   computed: {
     ...mapGetters({
       accountSummary: 'getAccountSummary',
+      accountReport: 'getAccountReports',
     }),
     calculateTrend() {
       return metric_key => {
@@ -19,15 +20,32 @@ export default {
     },
     displayMetric() {
       return metric_key => {
-        if (
-          ['avg_first_response_time', 'avg_resolution_time'].includes(
-            metric_key
-          )
-        ) {
+        if (this.isAverageMetricType(metric_key)) {
           return formatTime(this.accountSummary[metric_key]);
         }
         return this.accountSummary[metric_key];
       };
     },
+    displayInfoText() {
+      return metric_key => {
+        if (this.metrics[this.currentSelection].KEY !== metric_key) {
+          return '';
+        }
+        if (this.isAverageMetricType(metric_key)) {
+          const total = this.accountReport.data
+            .map(item => item.count)
+            .reduce((prev, curr) => prev + curr, 0);
+          return `${this.metrics[this.currentSelection].INFO_TEXT} ${total}`;
+        }
+        return '';
+      };
+    },
+    isAverageMetricType() {
+      return metric_key => {
+        return ['avg_first_response_time', 'avg_resolution_time'].includes(
+          metric_key
+        );
+      };
+    },
   },
 };