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Aleksei Sviridkin
7ec5dff93a
The counters the node-join failure path collects are read in whatever unit their source publishes: time in the CPU rows, events in the KVM exits, instantaneous values and running maxima in the files beside those. Not one of them carries a unit of work of its own, so a machine that spent every tick and got a fraction of the work done reads healthy in all of them. Add a collector that carries its own unit of work. It runs two fixed amounts of work at the runner layer and times each: a loop over a handful of integer-valued scalars, which pressure on the shared cache or the memory controller moves little, and a store stream through blocks larger than the last-level cache one core can allocate into, which is dominated by it. Fixed work gives each reading a scale of its own, so a red run can be read with no green one beside it, and the capture states the expected range and where the estimate comes from. Sampled where the three counter pairs already are, before the wait on every run and after it on both paths, but outside their brackets: it occupies a core rather than reading a file, and a burn inside one of those intervals would land in the interval each pair divides by: runner-kernel CPU time charged to the join window, and for the two counting the guests, a core taken away from what they count. Two arms, each under a twenty-second ceiling with the five-second kill grace behind it, so fifty seconds at worst against the 420s diagnostics budget. The budget guard derives that from the ceiling the source declares, and the phase-warning guard names the canary among the collectors that keep running when timeout is missing. An exit shaped like the ceiling is attributed to it only when the whole bound was on the clock: an outside kill produces the same status, and read by status alone it would publish exactly the finding this collector exists to detect. A reading below the range the legend states, and an arm the ceiling stopped before it could produce one, reach the job log from all three reporting sites, each naming where it was taken, the way a missing reading does from the two outside the diagnostics block. On the passing path the report that holds the figure is the artifact nobody downloads. Each floor is printed in the legend it comes from and sits where a bounded arm crosses it before the ceiling stops the arm, because a floor the ceiling reaches first never fires: the arm is cut off before its rate can fall that far, and every alert then arrives as a bound rather than as the slowdown the floor was meant to name. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Aleksei Sviridkin <3811295@gmail.com>