Enum MetricKind 

#[repr(u8)]
pub enum MetricKind {
    Counter = 0,
    Gauge = 1,
    Histogram = 2,
}

Kind of metric being recorded. The hub dispatches each call into the matching metrics crate primitive (counter! / gauge! / histogram!). #[repr(u8)] pins the discriminant so plugins built against any version of this crate agree on the wire encoding.

Variants

Counter = 0

Monotonically-increasing counter. value is the increment (commonly 1.0, but plugins recording batch counts may pass larger values). The hub casts via value as u64 — fractional values are truncated.

Gauge = 1

Point-in-time gauge. value replaces the previous value for the matching (name, labels) tuple.

Histogram = 2

Histogram observation. value is the observed quantity (e.g. a latency in seconds). The hub’s exporter is configured with default bucket boundaries; operators that need custom buckets for a specific plugin metric can declare them via the hub’s PrometheusBuilder::set_buckets_for_metric config (see the hub’s init_metrics for the existing spoa_message_duration bucket override).

Trait Implementations

impl Clone for MetricKind

fn clone(&self) -> MetricKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MetricKind

impl Debug for MetricKind

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

Formats the value using the given formatter.

impl Eq for MetricKind

impl PartialEq for MetricKind

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MetricKind