Deploy `/etc/logrotate.d/alertmanager`.

cookbooks/prometheus/alertmanager_setup.rb

@@ -54,6 +54,13 @@ service 'rsyslog' do
   action :nothing
 end
 
+# Deploy `logroted` config for `alertmanager`:
+remote_file '/etc/logrotate.d/alertmanager' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+end
+
 # Firewall settings here:
 %w( 9093/tcp ).each do |p|
   execute "ufw allow #{p}" do

cookbooks/prometheus/files/etc/logrotate.d/alertmanager

@@ -0,0 +1,13 @@
+/var/log/alertmanager.log
+{
+        rotate 4
+        weekly
+        missingok
+        notifempty
+        compress
+        delaycompress
+        sharedscripts
+        postrotate
+                /usr/lib/rsyslog/rsyslog-rotate
+        endscript
+}

cookbooks/prometheus/files/etc/rsyslog.d/30-alertmanager.conf

@@ -0,0 +1,7 @@
+# Log kernel generated digdag log messages to file
+:syslogtag,contains,"alertmanager" /var/log/alertmanager.log
+
+# Uncomment the following to stop logging anything that matches the last rule.
+# Doing this will stop logging kernel generated UFW log messages to the file
+# normally containing kern.* messages (eg, /var/log/kern.log)
+& stop