How should I monitor CPU usage on my WSA appliance deployment using SNMP?
Any WSA appliance deployment
Part of monitoring the health of a WSA deployment is monitoring CPU usage. CPU usage is exposed via SNMP for ease of monitoring.
The relevant portion of the SNMP MIB is named cacheBusyCPUPct, with an OID of .126.96.36.199.4.1.154188.8.131.52.1.5.0. Polling this OID results in an integer value between 0 and 10,000, expressed in hundredths of a percent. For instance, a value of 347 indicates CPU usage of 3.47%.
CPU usage is defined as percentage of available CPU on the device used by all processes in the last ten seconds. This includes:
Main HTTP proxy process
Anti-malware scanning engines
URL categorization and WBRS engines
Logging and reporting
Web UI and CLI
Other miscellaneous processes
This value should be similar to the values exposed in the web UI in the Overview report, and in the CLI by the "rate" command. Differences should be slight, and indicate slight differences in sampling time between the three locations.