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68 lines
2.1 KiB
Markdown
68 lines
2.1 KiB
Markdown
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# Opentelemetry [](https://github.com/AestheticIntegration/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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## Features
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- [x] basic traces
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- [x] basic metrics
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- [ ] 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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* [ ] 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 T = Opentelemetry
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let (let@) f x = f x
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let foo x =
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let@ (tr,sp) = T.Trace.with_
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~service_name:"myservice" "foo" ~attrs:["hello", `String "world"] in
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(* … *)
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let gc = Gc.stat() in
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T.Metrics.(
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emit [
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gauge ~name:"foo.gc.major_heap_words" [int gc.Gc.heap_words];
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sum ~name:"foo.gc.minor_allocated" [float gc.Gc.minor_words];
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]);
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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) to some other collector (eg. `otelcol`
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or the datadog agent).
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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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