Struct TraceSpan 

pub struct TraceSpan {

    pub id: SpanId,
    pub parent_id: Option<SpanId>,
    pub name: String,
    pub kind: SpanKind,
    pub start_time: Option<String>,
    pub end_time: Option<String>,
    pub tokens: Option<SpanTokenUsage>,
    pub cost: Option<f64>,
    pub latency_ms: Option<u64>,
    pub metadata: Value,
    pub status: SpanStatus,
    pub gen_ai_system: Option<String>,
    pub gen_ai_request_model: Option<String>,
    pub gen_ai_response_model: Option<String>,
    pub gen_ai_finish_reason: Option<String>,
    pub gen_ai_request_max_tokens: Option<u64>,
    pub gen_ai_request_temperature: Option<f64>,
    pub gen_ai_operation_name: Option<String>,
    pub gen_ai_tool_name: Option<String>,
}

A single trace span with parent-child relationships.

Fields

id: SpanId

Unique span identifier

parent_id: Option<SpanId>

Parent span ID (None for root spans)

name: String

Human-readable span name

kind: SpanKind

Span category

start_time: Option<String>

ISO 8601 start time

end_time: Option<String>

ISO 8601 end time

tokens: Option<SpanTokenUsage>

Token usage (for LLM spans)

cost: Option<f64>

Estimated cost in USD

latency_ms: Option<u64>

Measured latency in milliseconds

metadata: Value

Arbitrary key-value metadata

status: SpanStatus

Span completion status

gen_ai_system: Option<String>

gen_ai.system: The LLM provider name (e.g., “openai”, “anthropic”)

gen_ai_request_model: Option<String>

gen_ai.request.model: The model requested

gen_ai_response_model: Option<String>

gen_ai.response.model: The actual model used

gen_ai_finish_reason: Option<String>

gen_ai.response.finish_reason: Why the model stopped generating

gen_ai_request_max_tokens: Option<u64>

gen_ai.request.max_tokens: Maximum tokens requested

gen_ai_request_temperature: Option<f64>

gen_ai.request.temperature: Temperature parameter

gen_ai_operation_name: Option<String>

gen_ai.operation.name: The operation name (chat, completion)

gen_ai_tool_name: Option<String>

gen_ai.tool.name: The tool name (for tool spans)

Trait Implementations

impl Clone for TraceSpan

fn clone(&self) -> TraceSpan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TraceSpan

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TraceSpan

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for TraceSpan

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.