Struct Measurement 

pub struct Measurement {
    pub placebos: u64,
    pub judged: u64,
    pub tail_shown: u64,
    pub tail_applied: u64,
}

What the checks measure for the learned policy without costing the fixed rule any quality: under the fixed default the placebo collects the not-now labels the fixed rule’s own history cannot give (tasks/todo.md, amendment 2026-10-29). Counted over the applies the summary keeps, as labels counts its placebo rows (select/summary.rs Apply, its route and label).

Fields

placebos: u64

Placebos drawn: applies no route delivered, judged blindly where a free delivery would be.

judged: u64

Of them, those the judge gave a verdict that says something (changed or ignored).

tail_shown: u64

The tail samples’ lessons shown past the pool budget, and those that applied (whole.rs tail, select/summary.rs Pool::tail): the yield past the budget, learned under every policy.

tail_applied: u64

Trait Implementations

impl Clone for Measurement

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Measurement

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

Formats the value using the given formatter.

impl Default for Measurement

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Measurement

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Measurement

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 Measurement