feat(vpaas): Track vpaas conference join

react/features/analytics/AnalyticsEvents.js

     };
 }
 
+/**
+ * Creates an event for joining a vpaas conference.
+ *
+ * @param {string} tenant - The conference tenant.
+ * @returns {Object} The event in a format suitable for sending via
+ * sendAnalytics.
+ */
+export function createVpaasConferenceJoinedEvent(tenant) {
+    return {
+        action: 'vpaas.conference.joined',
+        attributes: {
+            tenant
+        }
+    };
+}
+
 /**
  * Creates an event for an action on the welcome page.
  *

react/features/billing-counter/middleware.js

+import { sendAnalytics, createVpaasConferenceJoinedEvent } from '../analytics';
+import { CONFERENCE_JOINED } from '../base/conference/actionTypes';
 import { PARTICIPANT_JOINED } from '../base/participants/actionTypes';
 import { MiddlewareRegistry } from '../base/redux';
 
 import { SET_BILLING_ID } from './actionTypes';
 import { countEndpoint } from './actions';
-import { setBillingId } from './functions';
+import { isVpaasMeeting, extractVpaasTenantFromPath, setBillingId } from './functions';
 
 /**
  * The redux middleware for billing counter.
 
 MiddlewareRegistry.register(store => next => async action => {
     switch (action.type) {
+    case CONFERENCE_JOINED: {
+        _maybeTrackVpaasConferenceJoin(store.getState());
+
+        break;
+    }
     case SET_BILLING_ID: {
         setBillingId(action.value);
 
 
     return next(action);
 });
+
+/**
+ * Tracks the conference join event if the meeting is a vpaas one.
+ *
+ * @param {Store} state - The app state.
+ * @returns {Function}
+ */
+function _maybeTrackVpaasConferenceJoin(state) {
+    if (isVpaasMeeting(state)) {
+        sendAnalytics(createVpaasConferenceJoinedEvent(
+            extractVpaasTenantFromPath(
+                state['features/base/connection'].locationURL.pathname)));
+    }
+}