How to monitor particular kit with Oversight: which sensor to use, where on the device to set up access, which user function and extraction rows read the response, and how to write the rules that turn it into an alarm. Search for a vendor, a product or an error message. A misspelt word still finds its article when nothing matches exactly.
Chart
Any numeric reading can be put on one of five charts, numbered 1 to 5, or left on None. The setting appears in two places: the Chart column of each numeric slot in Extraction, and Chart, response time on the Polling panel for the sensor's own timing (connect time on a TCP sensor, and the value read on an SNMP sensor). Text slots cannot be charted.
The number belongs to the device, not the sensor. Every reading on a device given Chart 2 is drawn on the same chart, whichever sensor it comes from. Give each of a server's volumes Chart 2 and they plot side by side; give CPU and memory Chart 1 and they plot together on another.
- On the dashboard, the chart picker for a device offers Chart 1, Chart 2 and so on, each drawing exactly the readings given that number. Series picked by hand lets you tick your own instead. Your browser remembers which you last chose for each object.
- In alarms, where Charts in notifications is ticked on the Polling panel, the message carries every numbered chart the alarming sensor's readings are on, drawn across the whole device. A volume filling up arrives with the other volumes beside it. A sensor with nothing numbered sends up to four of its own readings instead. A recovery carries no charts.
Two units to a chart. A chart has a scale on each side, one for each of the first two units it holds. A reading in a third unit is left off and the legend says so. The unit is matched exactly as typed, so write it the same way every time: ms and Ms count as two units.