0.11

• add Span_kind.t, add {kind,set_kind} to Scope
• expose Span_status types
• add Scope.set_span_status
• add record_exception
• otel.trace: extension points for links, record_exn, kind
• otel.trace: set status of a span based on exception.message
• add cohttp upper bound version constraint
• in backends, call tick() before cleaning up
• reduce memory usage of Scope.t (@tatchi)
• remove dependency on ambient-context, vendor/inline/specialize it

0.10

• feat: add support for per-signal urls (by @tatchi)
• build: disable protobuf regeneration during normal library use
• fix: emit GC metrics even in the absence of custom metrics

0.9

• compat with trace 0.7

0.8

• feat: add dep on hmap, add standard keys to carry around a span context or trace id
• add semantic conventions for code and HTTP
• better debug message in curl backend
• make otel-trace a bit more lightweight

0.7

• add Span_link.of_span_ctx, Scope.to_span_ctx, dummy values
• feat: add Span_context, as required by OTEL API guidelines
• feat: record backtraces in error spans
• compat with trace 0.6
• ocurl: add ticker_interval_ms config
• ocurl: do some self-tracing optionally
• move protobuf code to opentelemetry.proto
• perf: rewrite parsing+printing for span ctx as w3c trace ctx
• perf: when we get multiple messages, check batches only once
• perf: use ocaml-protoc 3.0.1 for codegen, with faster pbrt

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