Add Pandora FMS to third party monitoring tools

Supersedes mongodb#2604

Author: p

source/administration/monitoring.txt

@@ -242,11 +242,17 @@ a paid subscription.
        <http://docs.datadoghq.com/integrations/mongodb/>`_ to visualize
        the performance of your MongoDB deployments.
 
-   * - `SPM Performance Monitoring <https://sematext.com/spm>`__
+   * - `SPM Performance Monitoring <https://sematext.com/spm>`_
 
      - `Monitoring, Anomaly Detection and Alerting
        <https://sematext.com/spm/integrations/mongodb-monitoring/>`_ SPM monitors all key MongoDB metrics together with infrastructure incl. Docker and other application metrics, e.g. Node.js, Java, NGINX, Apache, HAProxy or Elasticsearch. SPM provides correlation of metrics and logs.
 
+   * - `Pandora FMS <http://www.pandorafms.com/>`_
+
+     - Pandora FMS provides the `PandoraFMS-mongodb-monitoring
+       <http://blog.pandorafms.org/how-to-monitor-mongodb-or-how-to-keep-your-users-happy/>`_
+       plugin to monitor MongoDB.
+
 .. _stdout:
 .. _standard-output:
 .. _monitoring-standard-loggging: