What are some alternatives?
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Cyberark - Security for the Heart of the Enterprise
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
netdata - Real-time performance monitoring, done right
ServiceNow - ServiceNow automates and manages global enterprise service relationships. Create a single system of record for enterprise services, automate manual tasks, consolidate legacy ITIL systems.
Foxpass - Foxpass manages users, groups, and SSH keys (plus a LDAP and RADIUS interfaces) to increase an organization's server and network security.