150 Appendix C. Probes
Field Value
Send
Expect
Timeout* 10
Critical Maximum Latency
Warning Maximum Latency
Table C-13. General::UDP Check settings
C.4.6. General::Uptime (SNMP)
The General::Uptime (SNMP) probe records the time since the device was last started. It uses the
SNMP object identifier (OID) to obtain this value. The only error status it will return is UNKNOWN.
Requirements — SNMP must be running on the monitored system and access to the OID must be
enabled to perform this probe.
This probe’s transport protocol is User Datagram Protocol (UDP).
Field Value
SNMP Community String* public
SNMP Port* 161
SNMP Version* 2
Timeout* 15
Table C-14. General::Uptime (SNMP) settings
C.5. Linux
The probes in this section monitor essential aspects of your Linux systems, from CPU usage to virtual
memory. Apply them to mission-critical systems to obtain warnings prior to failure.
Unlike other probe groups, which may contain one or a few probes that require the Red Hat Network
Monitoring Daemon, every Linux probe needs rhnmd to be running on the monitored system.
C.5.1. Linux::CPU Usage
The Linux::CPU Usage probe monitors the CPU utilization on a system and collects the following
metric:
• CPU Percent Used — The five-second average of the percent of CPU usage at probe execution.
Requirements — The Red Hat Network Monitoring Daemon (rhnmd) must be running on the moni-
tored system to run this probe.
Field Value
