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23 lines
2 KiB
Markdown
23 lines
2 KiB
Markdown
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## Copying from opentelemetry/opentelemetry-collector-contrib
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This files in the `prometheus/` and `prometheusremotewrite/` are copied from the OpenTelemetry Project[^1].
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This is done instead of adding a go.mod dependency because OpenTelemetry depends on `prometheus/prometheus` and a cyclic dependency will be created. This is just a temporary solution and the long-term solution is to move the required packages from OpenTelemetry into `prometheus/prometheus`.
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We don't copy in `./prometheus` through this script because that package imports a collector specific featuregate package we don't want to import. The featuregate package is being removed now, and in the future we will copy this folder too.
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To update the dependency is a multi-step process:
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1. Vendor the latest `prometheus/prometheus`@`main` into [`opentelemetry/opentelemetry-collector-contrib`](https://github.com/open-telemetry/opentelemetry-collector-contrib)
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1. Update the VERSION in `update-copy.sh`.
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1. Run `./update-copy.sh`.
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### Why copy?
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This is because the packages we copy depend on the [`prompb`](https://github.com/prometheus/prometheus/blob/main/prompb) package. While the package is relatively stable, there are still changes. For example, https://github.com/prometheus/prometheus/pull/11935 changed the types.
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This means if we depend on the upstream packages directly, we will never able to make the changes like above. Hence we're copying the code for now.
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### I need to manually change these files
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When we do want to make changes to the types in `prompb`, we might need to edit the files directly. That is OK, please let @gouthamve or @jesusvazquez know so they can take care of updating the upstream code (by vendoring in `prometheus/prometheus` upstream and resolving conflicts) and then will run the copy
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script again to keep things updated.
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[^1]: https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/pkg/translator/prometheus and https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/pkg/translator/prometheusremotewrite
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