What are some alternatives?
logstash - logstash is a tool for managing events and logs.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
Icinga - Icinga is a fork of Nagios and is backward compatible.