Fix: Make the shim's guards expressions, not asserts

[JoshSag]

Follow-up to #1311, from its review.

The problem

The version floor #1311 added is a Python assert inside a Dockerfile RUN. A RUN inherits the
base image's ENV, and PYTHONOPTIMIZE strips asserts. With it set, a core from 1.31 to 1.33 is
pinned to itself, uv lands on a starlette instrumentor built for starlette<0.15, and the bake and
the attestation both pass with instrumentation off at runtime. The attestation's own checks in
build-otel-shim.sh are asserts too, and run under the same ENV.

The change

• Dockerfile.otel-shim: the floor is an expression, … >= (1, 34) or sys.exit(1). It stays an
  expression because the RUN joins its lines with ;, so an if cannot follow.
• build-otel-shim.sh: the three attestation asserts become … or sys.exit("…"), same messages.
• The install refusal no longer says "no contrib release is paired with that version" when the pin
  is the default distro, where no pairing is involved. RECIPE.md gives the two cases, each with
  its next step.

Testing

input	PYTHONOPTIMIZE	main	this branch
core 1.32.1	unset	pins opentelemetry-distro==0.65b0	same
core 1.32.1	1 or 2	pins opentelemetry-api==1.32.1	pins opentelemetry-distro==0.65b0
core 1.43.0	unset, 1, 2	pins opentelemetry-api==1.43.0	same
none	unset, 1, 2	pins opentelemetry-distro==0.65b0	same

The RUN text was run exactly as the Dockerfile joins it, under sh -c, against venvs.

Attestation, on an image baked from this branch (weather_tool, core 1.43.0, 0.64b0): with
PYTHONOPTIMIZE=1 and the gate off, main's script exits 0; this branch's exits 1 with
hook did not run. With the gate on it passes with and without the variable.

The refusal on the fallback pin, driven on python:3.9-slim with no OpenTelemetry:

the bake is pinned to opentelemetry-distro==0.65b0
  × No solution found when resolving dependencies:
  ╰─▶ Because the current Python version (3.9.25) does not satisfy
      Python>=3.10 and opentelemetry-distro==0.65b0 depends on Python>=3.10,
REFUSING: the shim could not be installed alongside opentelemetry-distro==0.65b0 (uv's error is above; RECIPE step 2 reads it)

The whole failure, end to end: a Starlette 1.7 app on core 1.32.1 with PYTHONOPTIMIZE=1 in its
image. main pins opentelemetry-api==1.32.1, installs starlette instrumentor 0.53b1, builds and
attests clean; at runtime the instrumentor logs DependencyConflict: requested: "starlette >= 0.13, <0.15" and a request carrying a traceparent makes two outbound calls on two new trace ids. This
branch pins opentelemetry-distro==0.65b0 and the outbound calls carry the inbound trace id.

Images baked by main and by this branch from weather_tool (core 1.43.0) and slack_researcher
(no OpenTelemetry) have identical installed package sets (92 and 71 distributions).

Summary by CodeRabbit

• Bug Fixes
  • OpenTelemetry version and attestation checks now continue to run when Python optimization is enabled, helping prevent incompatible setups from passing verification.
• Documentation
  • Updated setup guidance to distinguish unavailable paired releases from incompatible installed releases, with capture-only steps for each case.
  • Clarified where to find install-failure guidance and which printed output to check after attestation failures.

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• deploy/lineage-attach/RECIPE.md

📝 Walkthrough

Walkthrough

The OpenTelemetry shim now checks the API version floor and propagation conditions with explicit failures that remain active when Python optimization strips assertions. Installation and attestation guidance has also changed.

Changes

OpenTelemetry shim validation and guidance

Layer / File(s)	Summary
Optimization-safe checks and guidance deploy/lineage-attach/Dockerfile.otel-shim, deploy/lineage-attach/build-otel-shim.sh, deploy/lineage-attach/RECIPE.md	The API version floor and propagation checks now exit explicitly on failure. The install-failure message points to RECIPE step 2. The recipe distinguishes contrib-release availability from app-environment installation failures and refers to the printed attestation line.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: huang195

Merge Risk: 🔵 Low · up to dee5f

Builders may wait for a paired release when an instrumentor dependency conflict is the actual blocker. Clarify the troubleshooting guidance before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files. (2 skipped: 2…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: replacing the shim’s assertions with explicit guards that remain active when Python optimization is enabled.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @deploy/lineage-attach/build-otel-shim.sh:
- Line 269: Update the OTEL_TRACES_EXPORTER check in the attestation so it
accepts only the value "none"; reject missing or any other value, including
"otlp".

Review comments at @deploy/lineage-attach/RECIPE.md:
- Line 58: Update the install-failure guidance in the `REFUSING: the shim could
not be installed alongside` paragraph to describe an API/contrib mismatch as one
possible resolver cause, not the assumed cause. Direct readers to use uv’s error
to identify the blocker, and apply the capture-only guidance for an API mismatch
or distro incompatibility only when uv reports that specific issue.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 754b3cb3-08bb-4cfd-9516-8803112682d3

📥 Commits

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📒 Files selected for processing (3)

• deploy/lineage-attach/Dockerfile.otel-shim
• deploy/lineage-attach/RECIPE.md
• deploy/lineage-attach/build-otel-shim.sh

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[evaline-ju]

PYTHONOPTIMIZE in the base image's ENV strips assert, silently defeating #1311's 1.34 floor and the three attestation checks. Converting to … or sys.exit(…) expressions is the right fix.