[10/N][VQueue] Basic scheduler metrics #4060
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…nized with eligibility_at This changeset makes sure that we have a reliable datum point that's shared between the delayed queue internal timer wheel and the scheduler. Additionally, it ensures that the scheduler can create `Instant` values that are synchronized with the datum point acquired from UniqueTimestamp. This fixes the issue introduced in changeset 6e65909 where we would become eligible slightly before the actual eligibility time, causing supurious rescheduling.
Introduces a small set of cumulative metrics from the vqueue scheduler to help visualize: - The rate of items in scheduler decisions broken down by action - The enqueue rate (in waiting inbox) - Counters for confirmed/rejected items (confirmed items is low signal and we can remove it) - The cumulative wait time on invoker capacity. The absolute value itself is not interesting, but the growth in the value indicates active throttling based on invoker concurrency.
This was referenced Nov 25, 2025
[9/N][VQueues] Ensure the scheduler's internal clock wheel is synchronized with eligibility_at
#4057
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Introduces a small set of cumulative metrics from the vqueue scheduler to help visualize:
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