Struct Event 

pub struct Event {
    pub seq: u64,
    pub at: SystemTime,
    pub timeout: Option<Duration>,
    pub delay: Option<Duration>,
    pub error: Option<String>,
    pub attempt: Option<u64>,
    pub task: Option<String>,
    pub kind: EventKind,
}

Runtime event with optional metadata.

Carries information about task lifecycle, retries, errors, backoff delays, and timing.

Fields

• seq: Unique sequence number for ordering (monotonically increasing)
• at: Wall-clock timestamp (may go backwards due to NTP, use for logging only)
• monotonic: Monotonic timestamp (never goes backwards, use for interval measurements)
• kind: Event classification
• task, error, attempt, timeout, delay: Optional metadata

Fields

seq: u64

Globally unique, monotonically increasing sequence number. Used to determine event ordering across async boundaries.

at: SystemTime

Wall-clock timestamp (may go backwards, use for logging only).

timeout: Option<Duration>

Task timeout (if relevant).

delay: Option<Duration>

Backoff delay before retry (if relevant).

error: Option<String>

Error message, if the event represents a failure.

attempt: Option<u64>

Attempt count (starting from 1).

task: Option<String>

Name of the task, if applicable.

kind: EventKind

The kind of event.

Implementations

impl Event

pub fn now(kind: EventKind) -> Self

Creates a new event of the given kind with current timestamps and next sequence number.

pub fn with_error(self, msg: impl Into<String>) -> Self

Attaches an error message.

pub fn with_task(self, name: impl Into<String>) -> Self

Attaches a task name.

pub fn with_timeout(self, d: Duration) -> Self

Attaches a timeout duration.

pub fn with_delay(self, d: Duration) -> Self

Attaches a backoff delay.

pub fn with_attempt(self, n: u64) -> Self

Attaches an attempt count.

pub fn subscriber_overflow( subscriber: &'static str, reason: &'static str, ) -> Self

Creates a subscriber overflow event.

Emitted when a subscriber’s queue is full and an event is dropped.

pub fn subscriber_panicked(subscriber: &'static str, info: String) -> Self

Creates a subscriber panic event.

Emitted when a subscriber panics during event processing.

Trait Implementations

impl Clone for Event

fn clone(&self) -> Event

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Event

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

Formats the value using the given formatter.