0.6

• fix ticker thread shutdown
• migrated to OTEL proto files v1.0
• replace Thread_local with ocaml-ambient-context, allowing for implicit scope in Lwt/Eio contexts (#34)
• update ocaml-trace interface to use the new trace.0.3-style API (breaking, see #34)

0.5

• new implementation for ocurl backend, using ezcurl and queues
• refactor lwt: Use try%lwt over Lwt.catch
• add opentelemetry.trace (optional, depends on ocaml-trace)

0.4

• expose Scope.get_surrounding
• rehault of GC metrics
• Trace.with_ now has force_new_trace_id param
• use thread-local storage to store global scope
• add Span_link module
• add a Globals.default_span_kind ref to specify default span kind
• fix(otel-lwt): missing modules now re-exported
• fix(client-ocurl): fix tick version used in the absence of bg thread
• drop dep on ocaml-protoc as the generated code is checked-in
• update vendored otel to 0.19

0.3

• improve error reporting from ocurl exporter
• improve GC sample collection
• feat(ocurl): simpler, cleaner backend implementation, with graceful exit
• config: make Config.t private (breaking)

0.2

• require pbrt only, use ocaml-protoc as a lint
• add Metrics_callbacks module
• add histogram metrics (untested)
• basic support for logs
• expose tick function (useful in the absence of a background thread)
• debug the library is set via OTEL_OCAML_DEBUG
• provide conventions for standard metrics
• add runtime attrs to GC stats