This page gives more detail about each specific alert condition as well as indicating what the fields represent.
This page covers alerting in general, the Advanced Settings are at the bottom of the page.
3) No, there is no 'best' alert. Toner consolidation is the only alert that allows two conditions to be stipulated, days remaining and level, and it also includes the capability to include notifications for devices that haven't gone below the trigger percentage, but have gone below the 'include' percentage, allowing you to ship that cartridge as part of the same order and save shipping costs as a result. The capabilities of this trigger are high, but the trade-off is that for these to really work effectively the devices being covered by this trigger need to report in 1% increments from 100, all the way to 0.
That is likely not the case with your Ricoh devices. Typically these report in 10% increments from 100 down to 20, then switch to reporting low. The days remaining calculation is very trivial, when the toner level reported by the device on the current scan is lower than the previous scan, then we compute the days remaining, basically by looking at the percentage, the most recent toner change, determining the rate at which toner is being used, and predicting from that rate when the cartridge will run out.
When a device reports in 1% increments, this calculation could be done up to 80 times (assuming a low percentage of 20) with a Ricoh, only 8 times, the last being when it switches from 30 to 20, the calculation won't be completed again, so unless the device goes below the days remaining target by the time it hits 20%, it will not raise the alert until it runs empty. For a device like this, you may as well simply alert when the device reports 20 or lower and be done with it.
So for Ricoh devices I would suggest not trying to use days remaining functionality at all, because the Ricoh doesn't report toner with sufficient granularity to have confidence in the results of the calculation. Rather a simple toner level alert with a trigger value high enough to ensure you can fulfill the alert before the cartridge runs completely dry. Starting with the default value would be a good start, the tune the trigger value based on the real world performance.
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