Enum Metric 

#[non_exhaustive]
pub enum Metric {
    ClaimLatency,
    LeaseRenewal,
    LeaseRenewalLatency,
    ActiveTrialLeases,
    FailoverOutcome,
    OutboxLag,
    RemoteConnections,
    RemoteQueueTime,
    RemoteRequestLatency,
    RemotePageRestart,
    RemoteReplayEviction,
    SubprocessOutcome,
    SnapshotTrials,
    SnapshotStateEntries,
    SnapshotPendingOutbox,
    JournalBytesStaged,
    JournalCanonicalSize,
    JournalLockWait,
}

What a recorded measurement measures.

Closed on purpose. A metric name is a label dimension in every exporter that will consume these events, so the set of possible names must be knowable by reading this file — an open &str metric name is how a time-series database acquires a million dead series. Adding a variant is a deliberate, reviewable edit; #[non_exhaustive] keeps that edit non-breaking for out-of-tree matchers.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ClaimLatency

How long a worker took to claim a trial it had reserved.

LeaseRenewal

One lease heartbeat renewal attempt.

LeaseRenewalLatency

Whole microseconds spent in one lifecycle lease renewal attempt.

ActiveTrialLeases

Process-local number of live trial contexts holding a lease.

FailoverOutcome

One fail-over adjudication of a stale lease.

OutboxLag

How far a durable outbox record is behind its terminal commit.

RemoteConnections

Connections a remote endpoint is currently serving.

RemoteQueueTime

How long a remote request waited before it was served.

RemoteRequestLatency

How long a remote request took end to end.

RemotePageRestart

One remote immutable page-session restart after expiry or eviction.

RemoteReplayEviction

One completed remote lifecycle replay entry evicted by a bound.

SubprocessOutcome

One subprocess trial’s execution result.

SnapshotTrials

Number of trials materialized by one hydrated study snapshot.

SnapshotStateEntries

Number of side-state entries materialized by one hydrated study snapshot.

SnapshotPendingOutbox

Number of pending finalizations materialized by one hydrated study snapshot.

JournalBytesStaged

Bytes in one successfully staged complete journal image.

JournalCanonicalSize

Bytes in the canonical journal after one successful publication.

JournalLockWait

Whole microseconds from start through the terminal result of one journal append-lock acquisition call, including retries.

Implementations

impl Metric

pub const fn name(self) -> &'static str

The stable wire name of this metric.

Stable in the same sense as METRICS_TARGET: exporters and dashboards key on these strings, so a change here is a breaking change to somebody’s alert, not a rename.

Trait Implementations

impl Clone for Metric

fn clone(&self) -> Metric

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Metric

impl Debug for Metric

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

Formats the value using the given formatter.

impl Display for Metric

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

Formats the value using the given formatter.

impl Eq for Metric

impl Hash for Metric

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Metric

fn cmp(&self, other: &Metric) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Metric

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Metric

fn partial_cmp(&self, other: &Metric) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Metric