[sentry-junior]

Description

With #8117 (merged), a synchronous boto3 Invoke carries sentry-trace and baggage in ClientContext.custom. This PR adds the receiving side: the Lambda integration continues the trace from context.client_context.custom. ClientContext wins over event headers, because a forwarded HTTP event can still carry headers from further upstream.

sam local drops ClientContext, so the new ClientContextTrace test function hands the event's client_context to the runtime. That way the container tests can cover it.

This is Pablo's code from pablo/aws-lambda-client-context-trace. The one change: client_context and custom are read with getattr, so a context object without them falls back to event headers instead of failing. It's the first of three stacked PRs for the stretch Lambda work: this PR → trigger detection (#8222) → queue.process spans (#8223).

Issues

• resolves: PY-3009 (receiving side; feat(boto3): Add Lambda extension #8117 does the injection)
• Part of feat(boto3): Add trace propagation through Lambda Invoke #8071

via @dingsdax.

--

View Session [Sentry]

[github-actions]

Coverage Results 📊

✅ 58794 passed | ⏭️ 3071 skipped | Total: 61865 | Pass Rate: 95.04% | Execution Time: 155m 19s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -85010
Passed Tests	📉 -80316
Failed Tests	—
Skipped Tests	📉 -4694

All tests are passing successfully.

❌ Patch coverage is 16.67% (1 of 6 changed executable lines covered; target 80%).
Project statement coverage is 90.43% (up 0.19 percentage points from base (8abf619) to head (1b7058c)).

Changed files with executable lines (1)

File	Patch coverage	Changed executable lines
sentry_sdk/integrations/aws_lambda/_handler.py	16.67%	1/6 covered; missed: 193, 194, 195, 196, 198

Coverage diff

@@            Coverage Diff             @@
##        master     #8221       +/-##
==========================================
+ Coverage    90.24%    90.43%    +0.19%
==========================================
  Files          203       199        -4
  Tracked lines     27125     21790     -5335
  Branches     10142      7584     -2558
==========================================
- Hits         24478     19704     -4774
+ Misses        2647      2086      -561
+ Partials      1541      1255      -286

---

Generated by Coverage Action

[linear-code]

PY-3009