The document describes monitoring various system components and services using different agents. It mentions monitoring HTTP, MySQL, disk usage, mail logs, memcached, MySQL locks and table sizes, qmail sending status, SMTP, SNMP, and syslog using specialized agents that report issues. Multiple agents are used to monitor some services in parallel.

1. MadEye Classes. Agent Agent：：HTTP Agent::MySQL Officer Use Parallerl::ForkManager Notify IRC Mail

2. Agents Agent CombinedLog(check 404, 500) Disk(df) HTTP Maillog Memcached

3. Agents(2) MySQL MySQLLock MySQLTableSize QmailSend Queue(too many queues in qmail) SMTP SNMPDisk SysLog