Struct Event

pub struct Event<'a> { /* private fields */ }

Events represent single points in time where something occurred during the execution of a program.

An Event can be compared to a log record in unstructured logging, but with two key differences:

• Events exist within the context of a span. Unlike log lines, they may be located within the trace tree, allowing visibility into the temporal context in which the event occurred, as well as the source code location.
• Like spans, Events have structured key-value data known as fields, which may include textual message. In general, a majority of the data associated with an event should be in the event’s fields rather than in the textual message, as the fields are more structed.

Implementations

impl<'a> Event<'a>

pub fn dispatch(metadata: &'a Metadata<'a>, fields: &'a ValueSet<'_>)

Constructs a new Event with the specified metadata and set of values, and observes it with the current subscriber.

pub fn record(&self, visitor: &mut dyn Visit)

Visits all the fields on this Event with the specified visitor.

pub fn fields(&self) -> Iter

Returns an iterator over the set of values on this Event.

pub fn metadata(&self) -> &Metadata<'_>

Returns metadata describing this Event.

Trait Implementations

impl<'a> Debug for Event<'a>

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

Formats the value using the given formatter.