0.10

CHANGES:

• breaking: manual spans now take a explicit_span_ctx as parent, that
  can potentially be transmitted across processes/machines. It also
  is intended to be more compatible with OTEL.

• breaking trace.subscriber: timestamps are int64ns now, not floats

• breaking trace: pass a string trace_id in manual spans, which helps
  for backends such as opentelemetry. It's also useful for extensions.

• refactor trace-fuchsia: full revamp of the library, modularized, using subscriber API

• refactor trace-tef: split into exporter,writer,subscriber, using subscriber API

• feat: add trace.event, useful for background threads

• feat trace.subscriber: add Span_tbl, and a depopt on picos_aux

• feat trace.subscriber: tee a whole array at once

• feat tef-tldrs: use EMIT_TEF_AT_EXIT

• feat trace.subscriber: depopt on unix for timestamps

• refactor trace-tef: depopt on unix for TEF timestamps

0.9.1

CHANGES:

• fix: upper bound on ppxlib
• feat trace-tef: print names of non-closed spans upon exit
• fix: block signals in background threads

0.9

CHANGES:

• add an extensible sum type, so users can implement custom events. For example
  an OTEL collector can provide custom events to link two spans to one another.

0.8

CHANGES:

• add trace.subscriber instead of a separate library

• add trace-tef.tldrs, to trace multiple processes easily (with external rust daemon)

• breaking: trace-tef: use mtime.now, not a counter, for multiproc

• trace-fuchsia: require thread-local-storage 0.2

0.7

CHANGES:

• feat: add levels to Trace_core. Levels are similar to logs levels, to help control verbosity.

• add hmap as a depopt (#28)

• fix: truncate large strings in fuchsia

0.6

CHANGES:

• add ppx_trace for easier instrumentation.
  • let%trace span = "foo" in … will enter a scope span named "foo"
  • let%trace () = "foo" in … will enter a scope named "foo" with a hidden name
• add trace-fuchsia backend, which produces traces in the binary format
  of fuchsia.
  These traces are reasonably efficient to produce (~60ns per span on my machines)
  and reasonably compact on disk, at least compared to the TEF backend.

0.5

CHANGES:

• perf: reduce overhead in trace-tef
• perf: add Mpsc_queue, adapted from picos, to trace-tef

0.4

CHANGES:

• add ?data to counter_int and counter_float

• add float to user data

• add add_data_to_current_span and add_data_to_manual_span

• make explicit_span.meta mutable

• trace-tef: write to trace.json if env variable TRACE is either 1 or true

• trace-tef: emit function name, if provided, as a metadata key/value pair

• re-export trace.core in trace

• perf: in trace-tef, use broadcast instead of signal in the job queue

0.3

CHANGES:

• add explicit spans, for more precise tracing
• rename repo to ocaml-trace
• trace-tef: add a ticker thread to ensure we flush the file regularly

0.2

CHANGES:

• trace-tef: additional argument to with_setup; env for "stdout"/"stderr"
• refactor: avoid conflicting with stdlib Trace module by adding sublibrary trace.core.
  Programs that use compiler-libs.toplevel should use trace.core
  directly, because using trace will cause linking errors.
• perf(trace-tef): improve behavior of collector under contention by
  pulling all events at once in the worker