add broadcast websocket metrics

* Gather brroadcast websocket metrics and push them into redis every
configurable seconds.
* Pop metrics from redis in web view layer to display via the api on
demand

awx/api/views/metrics.py

@@ -15,6 +15,7 @@ from rest_framework.exceptions import PermissionDenied
 # AWX
 # from awx.main.analytics import collectors
 from awx.main.analytics.metrics import metrics
+from awx.main.analytics.broadcast_websocket import BroadcastWebsocketStatsManager
 from awx.api import renderers
 
 from awx.api.generics import (
@@ -39,3 +40,18 @@ class MetricsView(APIView):
         if (request.user.is_superuser or request.user.is_system_auditor):
             return Response(metrics().decode('UTF-8'))
         raise PermissionDenied()
+
+class BroadcastWebsocketMetricsView(APIView):
+    name = _('Broadcast Websockets')
+    swagger_topic = 'Broadcast Websockets'
+
+    renderer_classes = [renderers.PlainTextRenderer,
+                        renderers.PrometheusJSONRenderer,
+                        renderers.BrowsableAPIRenderer,]
+
+    def get(self, request):
+        ''' Show Metrics Details '''
+        if (request.user.is_superuser or request.user.is_system_auditor):
+            stats_str = BroadcastWebsocketStatsManager.get_stats_sync() or b''
+            return Response(stats_str.decode('UTF-8'))
+        raise PermissionDenied()

awx/api/views/root.py

@@ -107,6 +107,7 @@ class ApiVersionRootView(APIView):
         data['applications'] = reverse('api:o_auth2_application_list', request=request)
         data['tokens'] = reverse('api:o_auth2_token_list', request=request)
         data['metrics'] = reverse('api:metrics_view', request=request)
+        data['broadcast_websocket_metrics'] = reverse('api:broadcast_websocket_metrics_view', request=request)
         data['inventory'] = reverse('api:inventory_list', request=request)
         data['inventory_scripts'] = reverse('api:inventory_script_list', request=request)
         data['inventory_sources'] = reverse('api:inventory_source_list', request=request)