mirror of
https://github.com/ocaml-tracing/ocaml-opentelemetry.git
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93 lines
3.4 KiB
OCaml
93 lines
3.4 KiB
OCaml
(** [opentelemetry.trace] implements a {!Trace_core.Collector} for
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{{:https://v3.ocaml.org/p/trace} ocaml-trace}.
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After installing this collector with {!setup}, you can consume libraries
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that use [ocaml-trace], and they will automatically emit OpenTelemetry spans
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and logs.
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Ambient_context is used to track the current ambient span.
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We use [Trace_core.extension_event] to add more features on top of the
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common tracing interface. For example to set the "span kind":
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{[
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let@ span = Trace_core.with_span ~__FILE__ ~__LINE__ "my-span" in
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Opentelemetry_trace.set_span_kind span Span_kind_client
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(* ... *)
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]} *)
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module OTEL := Opentelemetry_core
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module Otrace := Trace_core
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(** The extension events for {!Trace_core}. *)
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module Extensions : sig
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type Otrace.span +=
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| Span_otel of OTEL.Span.t (** The type of span used for OTEL *)
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type Otrace.extension_event +=
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| Ev_link_span of Otrace.span * OTEL.Span_ctx.t
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(** Link the given span to the given context. The context isn't the
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parent, but the link can be used to correlate both spans. *)
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| Ev_record_exn of {
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sp: Otrace.span;
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exn: exn;
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bt: Printexc.raw_backtrace;
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}
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(** Record exception and potentially turn span to an error *)
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| Ev_set_span_kind of Otrace.span * OTEL.Span_kind.t
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| Ev_set_span_status of Otrace.span * OTEL.Span_status.t
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type Otrace.metric +=
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| Metric_hist of OTEL.Metrics.histogram_data_point
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| Metric_sum_int of int
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| Metric_sum_float of float
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end
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val setup : unit -> unit
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(** Install the OTEL backend as a Trace collector *)
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val setup_with_otel_exporter : OTEL.Exporter.t -> unit
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(** Same as {!setup}, but using the given exporter *)
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val setup_with_otel_backend : OTEL.Exporter.t -> unit
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[@@deprecated "use setup_with_otel_exporter"]
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val collector_of_exporter : OTEL.Exporter.t -> Trace_core.collector
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val collector : unit -> Trace_core.collector
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[@@deprecated "use collector_of_exporter, avoid global state"]
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(** Make a Trace collector that uses the main OTEL backend to send spans and
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logs *)
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val ambient_span_provider : Trace_core.Ambient_span_provider.t
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(** Uses {!Ambient_context} to provide contextual spans in {!Trace_core}.*)
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val link_spans : Otrace.span -> Otrace.span -> unit
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(** [link_spans sp1 sp2] modifies [sp1] by adding a span link to [sp2].
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@since 0.11 *)
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val link_span_to_otel_ctx : Otrace.span -> OTEL.Span_ctx.t -> unit
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(** [link_spans sp1 sp_ctx2] modifies [sp1] by adding a span link to [sp_ctx2].
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It must be the case that [sp1] is a currently active span.
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@since NEXT_RELEASE *)
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val set_span_kind : Otrace.span -> OTEL.Span.kind -> unit
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(** [set_span_kind sp k] sets the span's kind. *)
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val set_span_status : Otrace.span -> OTEL.Span_status.t -> unit
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(** @since NEXT_RELEASE *)
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val record_exception : Otrace.span -> exn -> Printexc.raw_backtrace -> unit
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(** Record exception in the current span. *)
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val with_ambient_span : Otrace.span -> (unit -> 'a) -> 'a
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(** [with_ambient_span sp f] calls [f()] in an ambient context where [sp] is the
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current span. *)
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val with_ambient_span_ctx : OTEL.Span_ctx.t -> (unit -> 'a) -> 'a
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(** [with_ambient_span_ctx spc f] calls [f()] in a scope where [spc] is the
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ambient span-context *)
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module Well_known : sig end
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[@@deprecated
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"use the regular functions such as `link_spans` or `set_span_kind` for this"]
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