syslog
syslog is a standardized protocol and message logging system that collects, transmits, and stores log messages from computer systems and network devices.
An open source tool, captainslog is a syslog protocol tool.
syslog allows applications, devices, and operating systems to generate and forward log events to a central logging server or system. syslog messages contain information about specific events or activities like timestamps or source IP addresses. Each log message is assigned a security level that indicates the importance or criticality of the event. The criticality of the event can be labeled as emergency, alert, critical, error, warning, notice, informational, and debug.
Most DigitalOcean Droplets running Ubuntu and Debian use syslog by default. You can see syslog messages by running nano /var/log/syslog.
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