Struct SpanStart 

pub struct SpanStart<'a> {
    pub name: &'a str,
    pub kind: SpanKind,
    pub parent: Option<SpanHandle>,
    pub attributes: Vec<(String, AttrValue)>,
    pub start_time_unix_nanos: Option<u64>,
}

Arguments for TracerPlugin::start_span. A struct rather than a long positional parameter list so the trait stays forward-compatible: new optional fields can be added without breaking existing implementations that use ..Default::default().

Fields

name: &'a str

Span name. Should follow OTel semantic conventions (e.g., for a server span handling GET /users/:id, use "GET /users/:id").

kind: SpanKind

Span kind. Defaults to SpanKind::Internal.

parent: Option<SpanHandle>

Parent span handle, or None for a root span. Non-None parents belonging to a different tracer are treated as unknown and the new span is rooted.

attributes: Vec<(String, AttrValue)>

Initial attributes set atomically with span creation. Equivalent to calling TracerPlugin::set_attribute for each pair after start_span, but gives implementations a chance to include them in the initial emission without a buffer flush.

start_time_unix_nanos: Option<u64>

Start time override, in nanoseconds since the Unix epoch. None means “use the tracer’s current clock” — this is the common case. Set this when recording historical or externally-sourced spans.

Trait Implementations

impl<'a> Clone for SpanStart<'a>

fn clone(&self) -> SpanStart<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for SpanStart<'a>

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

Formats the value using the given formatter.

impl<'a> Default for SpanStart<'a>

fn default() -> SpanStart<'a>

Returns the “default value” for a type.