pub const PROBE_CONCURRENCY_LIMIT: usize = 256;Expand description
Per-route concurrency caps (api S-26). A single global semaphore lets a
probe storm starve /invoke; per-route caps isolate the budgets.
Probe routes (/healthz, /metrics) get a generous budget because they
are cheap and a k8s deployment may have many replicas all scraping at
once. Invoke is the heaviest path — keep it tight. Reads and writes get
asymmetric caps because writes tend to compile Wasm and allocate engine
resources.