adds redash db size metrics to status page (re getredash#247)

client/app/pages/admin/status/index.js

@@ -10,6 +10,8 @@ function AdminStatusCtrl($scope, $http, $timeout, currentUser, Events) {
       delete data.workers;
       $scope.manager = data.manager;
       delete data.manager;
+      $scope.database_metrics = data.database_metrics;
+      delete data.database_metrics;
       $scope.status = data;
     });
 

client/app/pages/admin/status/status.html

@@ -43,5 +43,15 @@
         </li>
       </ul>
     </div>
+    <BR>
+    <div>
+      <ul class="list-group col-lg-4">
+        <li class="list-group-item active">Redash Database</li>
+        <li class="list-group-item" ng-repeat="(name, size) in database_metrics">
+          <span class="badge">{{size[1]}}</span>
+          <span> {{size[0]}} </span>
+        </li>
+      </ul>
+    </div>
   </div>
 </div>

redash/monitor.py

@@ -30,4 +30,14 @@ def get_status():
             'size': redis_connection.llen(queue)
         }
 
+    status['database_metrics'] = []
+    # have to include the fake FROM in the SQL to prevent an IndexError
+    queries = [
+        ['Query Results Size', "pg_size_pretty(pg_total_relation_size('query_results')) as size from (select 1) as a"],
+        ['Redash DB Size', "pg_size_pretty(pg_database_size('postgres')) as size from (select 1) as a"]
+    ]
+    for query_name, query in queries:
+        result = models.db.session.query(query).first()
+        status['database_metrics'].append([query_name, result[0]])
+
     return status