0.7
CHANGES:
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add Span_link.of_span_ctx, Scope.to_span_ctx, dummy values
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feat: add Span_context, as required by OTEL API guidelines
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feat: record backtraces in error spans
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compat with trace 0.6
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ocurl: add ticker_interval_ms config
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ocurl: do some self-tracing optionally
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move protobuf code to opentelemetry.proto
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perf: rewrite parsing+printing for span ctx as w3c trace ctx
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perf: when we get multiple messages, check batches only once
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perf: use ocaml-protoc 3.0.1 for codegen, with faster pbrt