What are some alternatives?
logstash - logstash is a tool for managing events and logs.
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.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
Site24x7 - Site24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.