LiveKit Telemetry

Important: This is an internal crate for client telemetry in LiveKit client SDKs and is not meant to be used directly.

It currently holds the shared data model and its encoding:

• Records. TelemetryEvent, LogRecord, Attribute / AttributeValue, Severity and SpanOutcome: the events, log lines and span outcomes a platform SDK hands over.
• Buffers. Bounded, drop-oldest queues for records and spans, each filed under the session (trace) it belongs to; every drop is counted.
• Encoding. OTLP/HTTP protobuf logs and traces, using the opentelemetry-proto message types only (no gRPC stack).

The pipeline that batches, caches and uploads records is not part of the crate yet.

Event names, attributes and span rules are defined in SPEC.md. It is the contract for the whole crate, including the parts not implemented yet.