7d66551622
Four defects stacked into one nonsense report: cartridges at 20% claiming four days, cartridges at 1% claiming weeks. The root cause is a Zabbix API detail. `limit` caps the whole result set rather than each item, and the query sorted ascending, so the cap kept the OLDEST rows in the window. A four-cartridge printer polled every five minutes writes over 100k readings in 90 days; the forecast was fitted to the first few days of that and nothing since. Every rate was real and every rate described a cartridge thrown away three months ago. Nothing in the output looks wrong, which is why it needed pinning in a test rather than a comment. A 90-day burn rate does not need every individual poll, so a long window now reads hourly trends - the table meant for this, a tenth of the rows, and kept longer. Raw history serves short windows and any item a site keeps no trends for. Both are fetched newest-first with the budget scaled per item. Second, the countdown was computed from the last stored reading while the level displayed was the live one, so the two could disagree by a whole cartridge. The live level is now what the countdown divides. A live level far above the stored run means it was swapped since the last reading, and that is reported as a replacement rather than as a collapse in the burn rate. Third, at or below 5% a cartridge reads as empty rather than as a slow drain. At 1% losing a tenth of a point a day the arithmetic says ten days. The printer is out of toner, and it is the first thing to order. Fourth, the days-left column spanned the printer's rows, so the printer's soonest figure was printed beside every supply it had. That alone accounts for the shape of both complaints: a healthy cartridge wearing its neighbour's deadline, and an empty one wearing a number that belonged to nothing on its row. Also fixes float-typed supplies vanishing from any printer that also had an integer-typed one - they live in different history tables and the fetch stopped at whichever answered first. Not verified against live data: Zabbix is not reachable from the dev box.
57 KiB
57 KiB