Enum EventKind 

pub enum EventKind {
    RunStart {
        run: String,
        wall_ms: Option<u64>,
        pid: Option<u32>,
    },
    CallStart {
        call: String,
        target: String,
        op: String,
    },
    CacheHit {
        call: String,
        target: String,
        scope: CacheStore,
    },
    CacheMiss {
        call: String,
        target: String,
        scope: CacheStore,
    },
    Throttle {
        call: String,
        target: String,
        wait_ms: u64,
    },
    BreakerReject {
        call: String,
        target: String,
    },
    BreakerHalfOpen {
        call: String,
        target: String,
    },
    BreakerOpen {
        call: String,
        target: String,
        cooldown_ms: u64,
    },
    BreakerClose {
        call: String,
        target: String,
    },
    AttemptStart {
        call: String,
        target: String,
        attempt: u32,
    },
    AttemptError {
        call: String,
        target: String,
        attempt: u32,
        class: ErrorClass,
        http_status: Option<u16>,
    },
    Backoff {
        call: String,
        target: String,
        attempt: u32,
        wait_ms: u64,
    },
    CallEnd {
        call: String,
        target: String,
        result: String,
        code: Option<ErrorCode>,
        attempts: u32,
    },
}

The event vocabulary, tagged "event" with snake_case names. call is the call’s trace_id (the Outcome field), so one call’s events can be selected out of an interleaved feed; target repeats on every event so a tail can filter without joining back to call_start.

Variants

RunStart

Per-run header, always seq 0: names the run and (production sinks only) anchors it to wall time and a pid.

Fields

run: String

The run id — also the event file’s stem.

wall_ms: Option<u64>

Milliseconds since the Unix epoch at sink open; absent under the deterministic test/bench constructor.

pid: Option<u32>

The emitting process id; absent under the test/bench constructor.

CallStart

A call entered the layer chain (every call’s first event; its seq is the TraceRef anchor).

Fields

call: String

target: String

op: String

CacheHit

The cache served the call (attempts stays 0).

Fields

call: String

target: String

scope: CacheStore

CacheMiss

A cache plan existed but held no fresh entry; the call runs live.

Fields

call: String

target: String

scope: CacheStore

Throttle

The rate limiter queued the call for wait_ms (emitted before the wait begins, so a live tail shows the queueing as it happens).

Fields

call: String

target: String

wait_ms: u64

BreakerReject

An open breaker failed the call fast (KEEL-E012; the effect never ran).

Fields

call: String

target: String

BreakerHalfOpen

Cooldown elapsed: this call is the breaker’s half-open probe.

Fields

call: String

target: String

BreakerOpen

The breaker tripped open (threshold reached, or the probe failed).

Fields

call: String

target: String

cooldown_ms: u64

BreakerClose

A successful probe closed a previously-open breaker.

Fields

call: String

target: String

AttemptStart

Attempt attempt (1-based) is about to invoke the effect.

Fields

call: String

target: String

attempt: u32

AttemptError

Attempt attempt failed with the given class (pre-retry-decision).

Fields

call: String

target: String

attempt: u32

class: ErrorClass

http_status: Option<u16>

Backoff

The retry layer is waiting wait_ms before the next attempt (emitted before the wait begins).

Fields

call: String

target: String

attempt: u32

wait_ms: u64

CallEnd

The call settled (every call’s last event). result mirrors the Outcome’s "ok" / "error"; code is the terminal error code.

Fields

call: String

target: String

result: String

code: Option<ErrorCode>

attempts: u32

Trait Implementations

impl Clone for EventKind

fn clone(&self) -> EventKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EventKind

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for EventKind

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for EventKind

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for EventKind

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 EventKind