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https://github.com/ocaml-tracing/ocaml-opentelemetry.git
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96 lines
2.9 KiB
Markdown
96 lines
2.9 KiB
Markdown
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# Opentelemetry [](https://github.com/imandra-ai/ocaml-opentelemetry/actions/workflows/main.yml)
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This project provides an API for instrumenting server software
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using [opentelemetry](https://opentelemetry.io/docs), as well as
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connectors to talk to opentelemetry software such as [jaeger](https://www.jaegertracing.io/).
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- library `opentelemetry` should be used to instrument your code
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and possibly libraries. It doesn't communicate with anything except
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a backend (default: dummy backend)
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- library `opentelemetry-client-ocurl` is a backend that communicates
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via http+protobuf with some collector (otelcol, datadog-agent, etc.)
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## License
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MIT
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## Features
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- [x] basic traces
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- [x] basic metrics
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- [x] basic logs
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- [ ] nice API
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- [x] interface with `lwt`
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- [x] sync collector relying on ocurl
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* [x] batching, perf, etc.
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- [ ] async collector relying on ocurl-multi
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- [ ] interface with `logs` (carry context around)
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## Use
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For now, instrument manually:
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```ocaml
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module Otel = Opentelemetry
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let (let@) f x = f x
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let foo () =
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let@ scope = Otel.Trace.with_ "foo"
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~attrs:["hello", `String "world"] in
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do_work();
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Otel.Metrics.(
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emit [
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gauge ~name:"foo.x" [int 42];
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]);
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do_more_work();
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()
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let main () =
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Otel.Globals.service_name := "my_service";
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Otel.GC_metrics.basic_setup();
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Opentelemetry_client_ocurl.with_setup () @@ fun () ->
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(* … *)
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foo ();
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(* … *)
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```
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## Configuration
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The library is configurable via `Opentelemetry.Config`, via the standard
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opentelemetry env variables, or with some custom environment variables.
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- `OTEL_EXPORTER_OTLP_ENDPOINT` sets the http endpoint to send signals to
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- `OTEL_OCAML_DEBUG=1` to print some debug messages from the opentelemetry library ide
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- `OTEL_RESOURCE_ATTRIBUTES` sets a comma separated list of custom resource attributes
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## Collector opentelemetry-client-ocurl
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This is a synchronous collector that uses the http+protobuf format
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to send signals (metrics, traces, logs) to some other collector (eg. `otelcol`
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or the datadog agent).
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## Collector opentelemetry-client-cohttp-lwt
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This is a Lwt-friendly collector that uses cohttp to send
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signals to some other collector (e.g. `otelcol`). It must be run
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inside a `Lwt_main.run` scope.
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## Opentelemetry-trace
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The optional library `opentelemetry.trace`, present if [trace](https://github.com/c-cube/trace) is
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installed, provides a collector for `trace`. This collector forwards and translates
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events from `trace` into `opentelemetry`. It's only useful if there also is also a OTEL collector.
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## License
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MIT
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## Semantic Conventions
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Not supported yet.
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- [ ] [metrics](https://opentelemetry.io/docs/reference/specification/metrics/semantic_conventions/)
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- [ ] [traces](https://opentelemetry.io/docs/reference/specification/trace/semantic_conventions/)
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- [ ] [resources](https://opentelemetry.io/docs/reference/specification/resource/semantic_conventions/)
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