Struct Evolution 

pub struct Evolution {
    pub enabled: bool,
    pub baseline: Option<Baseline>,
    pub max_regression: f64,
    pub allowed_kinds: Vec<ProposalKind>,
    pub require_sandbox: bool,
    pub require_approval: bool,
    pub keep_rollback: bool,
}

The evolution policy.

Fields

enabled: bool

Master switch for this section. Even with features.self_evolution on, a loop can leave evolution off for a single run.

baseline: Option<Baseline>

What proposals are measured against. Without one, no proposal can be adopted — only recorded.

max_regression: f64

How much a metric may worsen and still count as an improvement overall. Expressed as a fraction: 0.02 allows a two-percent regression.

Nonzero on purpose. A change that trades a hair of accuracy for half the cost is usually right, and a zero-tolerance gate refuses every such trade while admitting any change that touches nothing measured.

allowed_kinds: Vec<ProposalKind>

Which kinds of change may be proposed at all.

require_sandbox: bool

Require a proposal to have been trialled in isolation before adoption.

require_approval: bool

Require a human to approve adoption. Turning this off is refused in prod.

keep_rollback: bool

Keep the previous known-good configuration so an adoption can be undone.

Implementations

impl Evolution

pub fn allows(&self, kind: ProposalKind) -> bool

Whether a proposal of this kind may even be written.

pub fn is_improvement(&self, measured: &Baseline) -> Option<bool>

Whether measured beats baseline on every metric the baseline names, within Evolution::max_regression.

Returns None when there is no baseline — which is not “pass”, and the caller must not treat it as one.

pub fn regressions(&self, measured: &Baseline) -> Option<Vec<String>>

Every metric on which measured is worse than the baseline by more than the tolerance, each as a one-line account. Empty means no regression; None means there is no baseline to regress against.

Trait Implementations

impl Clone for Evolution

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 Evolution

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

Formats the value using the given formatter.

impl Default for Evolution

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Evolution

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for Evolution

fn schema_name() -> String

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn is_referenceable() -> bool

Whether JSON Schemas generated for this type should be re-used where possible using the $ref keyword.

impl Serialize for Evolution

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

where __S: Serializer,

Serialize this value into the given Serde serializer.