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Specify allowed characters for Baggage keys and values #3801

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merged 14 commits into from
Feb 22, 2024

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yurishkuro
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@yurishkuro yurishkuro commented Dec 21, 2023

Changes

  • Add missing spec language on what keys and values are allowed for the baggage.
  • Emphasize case sensitivity
  • Definitions are aligned with W3C Baggage Spec, but provide a distinction between API representation and the wire encoding (done by W3C Propagator)

@yurishkuro yurishkuro requested review from a team December 21, 2023 16:53
reyang
reyang previously approved these changes Dec 21, 2023
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Co-authored-by: Reiley Yang <[email protected]>
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Note: this could be a breaking change e.g. for Go SDK (open-telemetry/opentelemetry-go#3685), whose current implementation is wrong imo.

Signed-off-by: Yuri Shkuro <[email protected]>
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Note: this could be a breaking change e.g. for Go SDK (open-telemetry/opentelemetry-go#3685), whose current implementation is wrong imo.

I would say that we chose the wrong decision in OTel Go. Still we might try to fix it in some backwards-compatible way (by extending the API).

TL;DR; For me this is not a blocker for this PR.

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I am working towards making a fix in OTel Go: open-telemetry/opentelemetry-go#4804

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jkwatson commented Jan 7, 2024

Java is also not compliant with this. Currently, we only propagate keys/values that meet this definition, but we allow arbitrary keys for in-memory usage.

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I support @pellared comment on different concerns (the in-process API and the inter-process propagation). Maybe we can adjust this PR to only mention that invalid keys MUST NOT be propagated? Then we can spin off a separate issue/PR discussing on Baggage API part.

(Also this would be easy to do as it would align with what some SIGs already do)

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github-actions bot commented Feb 7, 2024

This PR was marked stale due to lack of activity. It will be closed in 7 days.

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Signed-off-by: Yuri Shkuro <[email protected]>
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Updated to allow arbitrary strings in the API, but caution that Propagators may not allow some keys.

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cc @open-telemetry/go-maintainers - the new wording makes Go implementation non-compliant, but it's not a breaking change for its API, you will just need to relax the checks (i.e. never return errors from baggage.New)

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Let's remind maintainers in the call next Monday about this, but otherwise we are fine to go.

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@carlosalberto are we good to merge?

@carlosalberto carlosalberto merged commit 3376533 into open-telemetry:main Feb 22, 2024
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@yurishkuro yurishkuro deleted the baggage-values branch February 22, 2024 15:58
carlosalberto pushed a commit to carlosalberto/opentelemetry-specification that referenced this pull request Oct 31, 2024
…y#3801)

## Changes

* Add missing spec language on what keys and values are allowed for the
baggage.
* Emphasize case sensitivity
* Definitions are aligned with W3C Baggage Spec, but provide a
distinction between API representation and the wire encoding (done by
W3C Propagator)
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10 participants