Enable libcnb tracing #320
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This enables `libcnb`'s `trace` feature, which means traces, spans, and events are written to OpenTelemetry export files on disk in the ephemeral build container, which can then be read by the Heroku build system or when debugging locally with Pack (so long as a suitable `--volume` mount has been configured). See: heroku/libcnb.rs#723 GUS-W-15148605.
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GitHub recently announced ARM support when using their public runners: https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/ This means we don't need to use the custom runner group for ARM CI jobs any more, which have a slower boot time, since they don't have a warm slack pool of machines. For example the CI run in #320 has been waiting for 11 mins for a runner to be available: ``` Waiting for a runner to pick up this job... ```
This was referenced Jan 23, 2025
colincasey
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edmorley
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GitHub recently announced ARM support when using their public runners: https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/ This means we don't need to use the custom runner group for ARM CI jobs any more, which have a slower boot time, since they don't have a warm slack pool of machines. For example the CI run in #320 has been waiting for 11 mins for a runner to be available: ``` Waiting for a runner to pick up this job... ``` GUS-W-17659818.
This was referenced Jan 23, 2025
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## heroku/python ### Added - Added `runtime.txt` support for the `python-3.X` major Python version form. ([#322](#322)) - Enabled `libcnb`'s `trace` feature. ([#320](#320)) ### Changed - The Python 3.13 version alias now resolves to Python 3.13.2. ([#326](#326)) - The Python 3.12 version alias now resolves to Python 3.12.9. ([#326](#326)) - Deprecated support for the `runtime.txt` file. ([#325](#325)) - Improved the error messages shown when the `.python-version` file contents aren't valid. ([#325](#325))
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## heroku/python ### Added - Added `runtime.txt` support for the `python-3.X` major Python version form. ([#322](heroku/buildpacks-python#322)) - Enabled `libcnb`'s `trace` feature. ([#320](heroku/buildpacks-python#320)) ### Changed - The Python 3.13 version alias now resolves to Python 3.13.2. ([#326](heroku/buildpacks-python#326)) - The Python 3.12 version alias now resolves to Python 3.12.9. ([#326](heroku/buildpacks-python#326)) - Deprecated support for the `runtime.txt` file. ([#325](heroku/buildpacks-python#325)) - Improved the error messages shown when the `.python-version` file contents aren't valid. ([#325](heroku/buildpacks-python#325))
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This enables
libcnb'stracefeature, which means traces, spans, and events are written to OpenTelemetry export files on disk in the ephemeral build container, which can then be read by the Heroku build system or when debugging locally with Pack (so long as a suitable--volumemount has been configured).See:
heroku/libcnb.rs#723
GUS-W-15148605.