Struct TopSpan 

pub struct TopSpan {

    pub trace_id: String,
    pub span_id: String,
    pub start_time: i64,
    pub duration: i64,
    pub model: Option<String>,
    pub system: Option<String>,
    pub session_id: Option<String>,
    pub prompt_id: Option<String>,
    pub input_tokens: u64,
    pub output_tokens: u64,
    pub cache_creation_tokens: u64,
    pub cache_read_tokens: u64,
    pub total_tokens: u64,
    pub finish_reason: Option<String>,
    pub conversation_id: Option<String>,
    pub cost: Option<f64>,
    pub cost_source: Option<String>,
    pub cost_reason: Option<String>,
    pub derived_output_tokens_per_sec: Option<f64>,
}

A single top-N expensive LLM span

Fields

trace_id: String

span_id: String

start_time: i64

Span start time (nanoseconds since Unix epoch)

duration: i64

Span duration in nanoseconds

model: Option<String>

system: Option<String>

session_id: Option<String>

prompt_id: Option<String>

input_tokens: u64

output_tokens: u64

cache_creation_tokens: u64

cache_read_tokens: u64

total_tokens: u64

finish_reason: Option<String>

First finish/stop reason for this span (e.g. “max_tokens”, “end_turn”).

conversation_id: Option<String>

gen_ai.conversation.id attribute if present.

cost: Option<f64>

Estimated cost in USD, computed server-side from the pricing database. None when no pricing data matched this row’s (model, system).

cost_source: Option<String>

Origin of the cost figure: “litellm”, “fallback”, or “none”.

cost_reason: Option<String>

Human-readable tooltip explaining why cost is None (e.g. “no pricing data for claude-foo on bedrock”).

derived_output_tokens_per_sec: Option<f64>

Derived output token throughput (output_tokens / span_duration_sec). Span duration includes network + queue time — not pure generation time.

Trait Implementations

impl Clone for TopSpan

fn clone(&self) -> TopSpan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TopSpan

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TopSpan

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for TopSpan

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

where __S: Serializer,

Serialize this value into the given Serde serializer.