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.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.