Struct BackendMetricsSnapshot 

pub struct BackendMetricsSnapshot {
    pub backend_generation: u64,
    pub generation: u64,
    pub devices: [Option<BackendDeviceMetricsSnapshot>; 64],
    pub attempts: BackendAttemptMetricsSnapshot,
}

Coherent fixed-cardinality snapshot of one backend metrics generation.

generation advances after each accepted store update. Consumers that combine this snapshot with another read can compare the two generations; unequal backend or store generations make a torn combination detectable. All device slots are fixed. None means that ordinal is not part of this backend generation.

Fields

backend_generation: u64

Backend resource generation that owns these metrics.

generation: u64

Store update sequence advanced after each accepted metric update.

devices: [Option<BackendDeviceMetricsSnapshot>; 64]

Fixed ordinal-indexed device slots; None for an unconfigured ordinal.

attempts: BackendAttemptMetricsSnapshot

Terminal counters and duration histograms accumulated at report readiness.

Implementations

impl BackendMetricsSnapshot

pub const fn device( &self, device_ordinal: usize, ) -> Option<BackendDeviceMetricsSnapshot>

Returns the configured device record for one bounded device ordinal.

pub fn project_backend_metric( &self, descriptor: &'static BackendMetricDescriptor, ) -> Result<Vec<BackendMetricSample>, BackendMetricProjectionError>

Projects one canonical descriptor from this coherent snapshot.

This is the only control-plane boundary that derives backend metric samples, labels, duration units, or histogram bucket semantics. An exporter therefore only iterates the immutable descriptor registry and selects its ingress by crate::metrics::BackendMetricKind.

Trait Implementations

impl Clone for BackendMetricsSnapshot

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 BackendMetricsSnapshot

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

Formats the value using the given formatter.

impl Eq for BackendMetricsSnapshot

impl PartialEq for BackendMetricsSnapshot

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for BackendMetricsSnapshot

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 BackendMetricsSnapshot