Struct ShadowSignal 

pub struct ShadowSignal {
    pub would_serve_rung: Option<u32>,
    pub would_pass: bool,
    pub projected_cost_usd: f64,
    pub actual_cost_usd: f64,
    pub skipped: Option<String>,
}

The rollout arm this request landed in (ADR 0009 D1), recorded so an auditor can re-derive arm membership from the receipt alone. Absent when the route has no rollout — byte-identical What Firstpass would have done for an observed request (ADR 0009 D2).

This describes a counterfactual that was never served, so it must never enter the conformal calibration set for served failures — it is a separate estimate with its own sample size. Pooling it with served outcomes would let a projection contaminate the published bound.

Fields

would_serve_rung: Option<u32>

Rung that would have been served, if any gate passed.

would_pass: bool

Whether the ladder would have produced a servable answer at all.

projected_cost_usd: f64

What the shadow evaluation cost to run.

actual_cost_usd: f64

What the request actually cost upstream, for comparison.

skipped: Option<String>

Present when shadow did not run, saying why — a skipped measurement is recorded rather than silently absent, so a projection that has stopped tracking is visible in the record.

Trait Implementations

impl Clone for ShadowSignal

fn clone(&self) -> ShadowSignal

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ShadowSignal

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ShadowSignal

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ShadowSignal

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ShadowSignal

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ShadowSignal