Module observability 

Observability layer — tracing, audit, cost tracking, and event sourcing.

Re-exports

pub use audit_trail::AuditAction;

pub use audit_trail::AuditError;

pub use audit_trail::AuditPersistence;

pub use audit_trail::AuditTrail;

pub use audit_trail::HashDigest;

pub use audit_trail::TrailEntry;

Modules

audit_trail

Tamper-evident audit trail with cryptographic hash chain (blake3).

Structs

AuditFilter

Filter criteria for querying the audit log.

AuditLog

Audit log — append-only event recorder with query and subscription.

CostBreakdown

Cost breakdown by category (USD).

CostSnapshot

Per-agent cost snapshot.

CostTracker

Cost tracker — accumulates token usage and computed costs per agent.

CostTrackerConfig

Configuration for the cost tracker.

EventQuery

Filter for querying events.

EventStore

Append-only event store with per-stream indexing.

EventStoreConfig

Configuration for the event store.

GlobalCostSnapshot

Global cost snapshot across all agents.

ObservabilityDecorator

Built-in decorator that bundles audit, authorizer, tracer, and cost tracker observability and applies them to every spawned agent.

Span

A single unit of work within a trace, with timing, status, and metadata.

SpanContext

Identifies a span within a trace and links it to its parent.

SpanGuard

RAII guard for an in-flight span; finalizes and records the span on drop.

SpanId

Unique span identifier.

StoredEvent

A stored domain event.

TokenUsage

Token usage broken down by component.

TraceId

Unique trace identifier.

Tracer

Collects completed spans and broadcasts them to subscribers.

Enums

AuditEntry

An audit trail entry.

SpanKind

Role or classification of a span within a trace.

SpanStatus

Outcome status of a span.

Traits

AgentDecorator

Pluggable transform applied to every agent a supervisor spawns.