Deploy `logrotate` config for `webhook`.

cookbooks/prometheus/alertmanager_webhook_setup.rb

@@ -23,3 +23,10 @@ end
 service 'rsyslog' do
   action :nothing
 end
+
+# Deploy `logrotate` config for `Alert Manager Webhook Logger`:
+remote_file '/etc/logrotate.d/webhook' do
+  owner 'root'
+  group 'root'
+  mode  '0644'
+end

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

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