0c0c7be439ea756258b48bbdbbd6b20247d9e0c0
4 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
cproudlock
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8b9b9363ee |
Toner: count cartridge changes that happened, and rate a burst as one burst
Two things reported from the floor, one cause each. "5 CHANGES IN 90 DAYS, THAT'S HARD TO BELIEVE." It was. A replacement was any +10 rise between readings, with no check on where it landed, so two shapes that are not swaps scored as swaps: a supply reading 0 or near-0 while it was out of the machine and then reading normally again, and a coarse gauge ticking back up after a reseat or a power cycle. A swap must now also LAND near full, because that is what a new cartridge reads, and a single dip that RECOVERS to roughly where it came from is dropped before anything looks at it. The dip filter keys on shape rather than cause, which is why it holds for all of them - a supply pulled out to be shaken, a door open mid-poll, or a site whose preprocessing maps the Printer MIB's unknown sentinels onto 0. It is NOT a Zabbix timeout: an item that does not answer records nothing rather than writing a zero. A genuine near-empty reading before a real swap does not recover, it jumps to full, so it survives and its swap still counts. find_replacements and current_run now read one predicate. When they disagreed, a phantom rise reset the run and threw away the history the estimate needed - so the bad count was quietly damaging the rate as well, which is why both were wrong at once. Expect replacement counts to FALL and per-cartridge history to lengthen. A BURST BIASED THE RATE FOR THE LIFE OF THE CARTRIDGE. The rate was the slope between the first and last reading of the run, and two endpoints cannot tell "steady" from "burst then stopped". A cartridge that lost 20 percent in two days and then barely moved for a month read as 0.83 percent/day forever after, so the report kept promising it would run out long after printing slowed. It is now the median of the per-interval rates: the burst is one interval among many rather than one of two points. Rising intervals are dropped as noise; flat ones stay in at zero, because a cartridge that did not move is real information. If every interval is flat or rising yet the run dropped overall, it falls back to the whole-run slope rather than reporting nothing. Where the intervals disagree by 5x or more the rate carries a marker and an explanation on hover. The number is still the best estimate available; the flag stops it reading as a measurement. The "Changed" column is "Replacements", and its cell says "2 in 90d" rather than "2 / 90d", which was read as a date, a ratio and a version number. |
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cproudlock
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3d83806135 |
Make the toner forecast an order, not a table
The report answers a purchasing question, and it was answering it in seven columns, two tables and a rowspan. What someone actually needs from it is a short list of what to buy. So it opens with that list, grouped by part number with a quantity. Two cartridges of the same part in different printers is a quantity of two, which is the number an order needs and the one a per-printer table made the reader count by hand. It covers what is empty plus what goes within a fortnight - ordering only what is already empty means running empty. There is a copy button, because it ends up pasted into a mail. Below it the cartridges sit in urgency bands rather than in one long list sorted by a number. The question is which pile a thing is in, and a pile that is empty is worth seeing as empty. Everything past "empty" starts collapsed; the order list above already covers the same ground in a tenth of the height. The row is a cartridge now, not a printer, so it can carry its own part number, its own level bar and its own countdown. Nesting supplies under a printer meant opening a printer to find out whether anything on it needed doing. Cartridges with no part mapped are counted on a single line rather than given one each. They cannot be dropped, since that would quietly shorten the order, and they cannot be ordered from here either - the job they represent is mapping them, which is one job however many there are. Bands and the order horizon are decided server-side, next to the arithmetic that produces them, so a heading cannot disagree with what got added to the list. Checked against a fleet of 43 dev printers with real part mappings, driven by a stub Zabbix - live Zabbix is not reachable from the dev box. |
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cproudlock
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7d66551622 |
Forecast from the right end of the window, and from the level shown
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. |
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cproudlock
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d109314123 |
Forecast when a printer runs out, and count what it has been through
The toner report says what is empty now. It could not say what to order, and nothing recorded how fast anything drains - every level read was cached for five minutes and then discarded. Zabbix has been keeping the history all along; we simply never asked. One history.get gives both answers, because a cartridge only goes DOWN while it is in use: a rise is a replacement. Count the rises and you have how many cartridges a printer has been through; fit a slope to the readings SINCE the last rise and you have days-to-empty. Fitting across a replacement averages a spent cartridge with a fresh one and describes neither. Sorted by days left, which is the point. A cartridge at 60% dropping 5% a day needs ordering before one sitting at 8% that has not moved in months, and a level-sorted list ranks those backwards. It refuses to guess. Too few readings, a level that has not moved enough - many printers report in 10% steps and sit on a plateau for a fortnight - or a recent replacement each produce no estimate and say which. Those printers are listed separately rather than sorted in as 0 or as 999, since a printer without an estimate is neither urgent nor safe. Estimates show what they rest on, because "9 days from 21 days of readings" and "9 days from 2 readings" are not the same claim. A separate report card, not an extension of the toner report: that one is an exceptions list a tech acts on today, this is an ordering view read monthly, and the history query is heavier than the live read it would have slowed down. The analysis is pure arithmetic over a list of readings, so the 14 tests cover the noise wobble, the plateau, the swap, junk rows and division by zero without needing Zabbix. Zabbix being unreachable is reported as such rather than rendering an empty table that reads as "nothing is due". |