Alternative infrastructure monitoring tools
For an overview of the variety of different infrastructure monitoring tools available today, check out the Gartner report at https://www.gartner.com/reviews/market/infrastructure-monitoring-tools.
Nagios
Originally launched in the late 1990s as NetSaint, Nagios is primarily a monitoring and alerting system, rather than an observability platform. The two systems can be used in parallel, with Nagios handling monitoring and alerting, and Grafana providing visualization and historical data analysis. Both Nagios and Grafana have commercial and open source (self-hosted) options. Visit https://www.nagios.com/solutions/security-log-monitoring for information on using Nagios for security log monitoring.
New Relic
An anagram of the company’s founder Lew Cirne, New Relic is much more an application performance monitoring tool, in the context of service-level management (rather than, say, levels of server load and CPU usage). For details...