Module telemetry 

Telemetry and metrics collection following OpenTelemetry GenAI conventions.

Provides lock-free, zero-allocation metrics collection for:

• Token usage (input, output, saved, compression ratio)
• Tool call latency and success rates
• Search quality metrics (latency, result counts)
• Embedding inference performance
• Cache hit/miss rates

Naming follows the OpenTelemetry GenAI Semantic Conventions: https://opentelemetry.io/docs/specs/semconv/gen-ai/

Structs

Metrics

MetricsSnapshot

Point-in-time snapshot of all metrics.

ToolCallTimer

RAII guard that records tool call latency on drop.

Functions

global_metrics

info_tags

Deployment tags shared by the Prometheus lean_ctx_info series and the Datadog push exporter. Values are bounded: project is the cwd basename (never the full path), model/profile/role come from bounded registries — cardinality stays at one series per running process.