Rotate Grafana logs

Fixes-bug: #1572930

Change-Id: I73eac6720c3e5d006b018c5d13c5c64267adb175

deployment_scripts/puppet/modules/lma_monitoring_analytics/manifests/grafana.pp

@@ -67,4 +67,13 @@ class lma_monitoring_analytics::grafana (
       },
     },
   }
+
+  file { '/etc/logrotate.d/grafana.conf':
+    ensure  => present,
+    content => template('lma_monitoring_analytics/logrotate.conf.erb'),
+    owner   => 'root',
+    group   => 'root',
+    mode    => '0644',
+    require => Class['::grafana'],
+  }
 }

deployment_scripts/puppet/modules/lma_monitoring_analytics/spec/classes/lma_monitoring_analytics_grafana_spec.rb

@@ -28,6 +28,8 @@ describe 'lma_monitoring_analytics::grafana', :type => :class do
         it { is_expected.to contain_package('grafana').with(
             :ensure => 'latest'
         )}
+
+        it { is_expected.to  contain_file('/etc/logrotate.d/grafana.conf') }
     end
 
     describe 'db_host without port number' do

deployment_scripts/puppet/modules/lma_monitoring_analytics/templates/logrotate.conf.erb

@@ -0,0 +1,22 @@
+# managed by puppet
+#
+# This configuration assumes that Grafana is configured to log here (which is
+# the default settled by the package)
+
+/var/log/grafana/*.log {
+    copytruncate
+    compress
+    delaycompress
+    missingok
+    notifempty
+    # logrotate allows to use only year, month, day and unix epoch
+    dateext
+    dateformat -%Y%m%d-%s
+    # number of rotated files to keep
+    rotate 10
+    # do not rotate files unless both size and time conditions are met
+    hourly
+    minsize 20M
+    # force rotate if filesize exceeded 100M
+    maxsize 100M
+}