Added two environment variables for configuring datadog api key

Author: pyconsult

datadog_callback.py

@@ -59,7 +59,8 @@ def _load_conf(self):
         else:
             print "Could not load configuration, invalid file: {}".format(file_path)
 
-        return conf_dict.get('api_key', ''), conf_dict.get('url', 'https://app.datadoghq.com')
+        return conf_dict.get('api_key', os.environ.get('DATADOG_API_KEY', '')), conf_dict.get('url', 'https://app.datadoghq.com')
+
 
     # Send event to Datadog
     def _send_event(self, title, alert_type=None, text=None, tags=None, host=None, event_type=None, event_object=None):