Installation and configuration:

• Install Monit
• Automatically Start Monit when system boots
• Enable SSL in Monit HTTP GUI
• Sending alerts via Gmail
• Unauthenticated read-only guest access

HTTP Proxy for Monit:

• Proxying Monit via Apache
• Proxying Monit via Nginx

Monitoring examples:

• Custom tests (sensors, top10)
• Monitoring Apache status
• Monitoring PostgreSQL Servers
• Monitoring Postfix Servers
• Websphere Application Server
• Liberty Profile Application Server

See here for more monitoring examples.