Reduce cacti updates cron spam

The current process to udpate cacti hosts is fairly chatty. It basically
goes in and just tries to update every host there and if they exist that
generates a bunch of output which is then emailed to infra roots. This
information is potentially useful for debugging so keep it around in
local cacti host logs. These logs will then be rotated with a week of
retention.

This should help make our inboxes happier.

Change-Id: Ib03ef7b22083a2a2454715bd5229313b19b84ae9

modules/openstack_project/manifests/cacti.pp

@@ -83,9 +83,21 @@ class openstack_project::cacti (
   cron { 'add cacti hosts':
     ensure  => present,
     user    => root,
-    command => 'for host in $(cat /var/lib/cacti/devices); do /usr/local/bin/create_graphs.sh $host; done',
+    command => 'for host in $(cat /var/lib/cacti/devices); do /usr/local/bin/create_graphs.sh $host >> /var/log/cacti_update.log 2>&1; done',
     minute  => '0',
   }
 
-
+  include logrotate
+  logrotate::file { 'cacti_update.log':
+    log     => '/var/log/cacti_update.log',
+    options => [
+      'compress',
+      'missingok',
+      'rotate 7',
+      'daily',
+      'notifempty',
+      'copytruncate',
+    ],
+    require => Cron['add cacti hosts'],
+  }
 }