Enum ObservationType 

pub enum ObservationType {
    Span,
    Generation,
    Agent,
    Tool,
    Chain,
    Retriever,
    Evaluator,
    Embedding,
    Guardrail,
    Event,
}

Available on crate feature otel only.

Langfuse observation kinds — the value written under LANGFUSE_OBSERVATION_TYPE.

Catalog: https://langfuse.com/docs/observability/features/observation-types

Variants

Span

Generic span (default fallback).

Generation

LLM generation — chat / completion call.

Agent

Agent invocation — root of an agent loop.

Tool

Tool execution.

Chain

Multi-step chain (compaction, MCP control-plane calls, …).

Retriever

Vector / document retriever step.

Evaluator

LLM-as-judge or other automated evaluator.

Embedding

Embedding generation step.

Guardrail

Policy / safety guardrail check.

Event

Discrete event marker.

Implementations

impl ObservationType

pub const fn as_str(self) -> &'static str

The wire string Langfuse expects under langfuse.observation.type.

Trait Implementations

impl Clone for ObservationType

fn clone(&self) -> ObservationType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ObservationType

impl Debug for ObservationType

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

Formats the value using the given formatter.

impl Eq for ObservationType

impl PartialEq for ObservationType

fn eq(&self, other: &ObservationType) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ObservationType