Struct JoinPrecheckStats 

pub struct JoinPrecheckStats {
    pub probe_hits: u64,
    pub probe_misses: u64,
    pub disabled_ineligible: u64,
    pub disabled_observation: u64,
    pub disabled_maintenance: u64,
}

Per-graph counters for the join membership pre-check (design 311 §8) — the always-on, per-Graph twin of the build-gated process-global EngineMetrics counters (join_probe_hit / join_probe_miss / join_precheck_disabled_*). Plain Cell adds on a !Send graph, so they cost nothing measurable.

Fields

probe_hits: u64

Probes that found the key in the region (the fetch ran, as today).

probe_misses: u64

Probes that missed — parent fetches skipped.

disabled_ineligible: u64

Joins disabled because the eligibility walk found a non-root chain (§2.4).

disabled_observation: u64

Joins disabled because a bound was crossed while observing a fetch (§2.5).

disabled_maintenance: u64

Joins disabled because a bound was crossed (or a count went inconsistent) on a parent-side push (§2.5).

Trait Implementations

impl Clone for JoinPrecheckStats

fn clone(&self) -> JoinPrecheckStats

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for JoinPrecheckStats

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for JoinPrecheckStats

fn default() -> JoinPrecheckStats

Returns the “default value” for a type.

impl PartialEq for JoinPrecheckStats

fn eq(&self, other: &JoinPrecheckStats) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for JoinPrecheckStats

impl Eq for JoinPrecheckStats

impl StructuralPartialEq for JoinPrecheckStats