Add submit_external_metrics

[lb-kamilk]

Description

Allow syncing external metrics to projects

Example usage:

project = client.get_project(PROJECT_ID)
# Build entries using the new schema# Build entries using the new schema
entries = [
# Entry 1: full label + review with rating, done queue
lb.ProjectSyncEntry(
task_id="test-task-031",
content_url="https://storage.example.com/data/test-task-031.json",
label=lb.ProjectSyncLabel(
submitted_by=lb.SubmittedBy(email="user@email.com"),
auto_qa=lb.AutoQA(
status=lb.AutoQaStatus.Approve,
score=0.92,
feedback="Looks good",
custom_scores=[
lb.CustomScore(name="accuracy", value=0.95),
lb.CustomScore(name="relevance", value=0.88),
],
),
seconds_to_completion=45.0,
submitted_on="2025-06-15T12:00:00.000Z",
),
review=lb.ProjectSyncReview(
reviewed_by=lb.ReviewedBy(email="user@email.com"),
rating=lb.GranularRating(score=5, comment="Excellent work"),
),
queue_type="DONE_QUEUE",
),
# Entry 2: label + review without rating, done queue
lb.ProjectSyncEntry(
task_id="test-task-032",
label=lb.ProjectSyncLabel(
submitted_by=lb.SubmittedBy(email="user@email.com"),
seconds_to_completion=30.0,
),
review=lb.ProjectSyncReview(
reviewed_by=lb.ReviewedBy(email="user@email.com"),
),
queue_type="DONE_QUEUE",
),
# Entry 3: label with rejected autoQA, no review, no content_url
lb.ProjectSyncEntry(
task_id="test-task-033",
label=lb.ProjectSyncLabel(
submitted_by=lb.SubmittedBy(email="user@email.com"),
auto_qa=lb.AutoQA(
status=lb.AutoQaStatus.Reject,
score=0.3,
feedback="Multiple errors found",
),
seconds_to_completion=120.5,
),
),
]
print(f"Syncing {len(entries)} entries...")
result = project.sync_external_project(entries)
print(f" submissionId={result.submission_id}")
print("Done!")

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Document change (fix typo or modifying any markdown files, code comments or anything in the examples folder only)

All Submissions

• Have you followed the guidelines in our Contributing document?
• Have you provided a description?
• Are your changes properly formatted?

New Feature Submissions

• Does your submission pass tests?
• Have you added thorough tests for your new feature?
• Have you commented your code, particularly in hard-to-understand areas?
• Have you added a Docstring?

Changes to Core Features

• Have you written new tests for your core changes, as applicable?
• Have you successfully run tests with your changes locally?
• Have you updated any code comments, as applicable?

---

Note

Medium Risk
Adds a new GraphQL mutation path and input serialization for project data sync; risk is mainly schema mismatch/serialization edge cases (e.g., optional vs explicit null) causing failed or incorrect syncs.

Overview
Adds a new Project.sync_external_project() method that calls a syncExternalProject GraphQL mutation to asynchronously push external label/review metadata (including AutoQA status/scores and queue state) into a project and returns a submission_id for tracking.

Introduces a new project_sync pydantic schema (ProjectSyncEntry, ProjectSyncLabel/Review, AutoQA, etc.) plus a _to_gql_input serializer (including explicit null support), and re-exports these types from labelbox.__init__ for SDK users.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Missing explicit-None handling for review field in serialization

Medium Severity

The _to_gql_input function handles explicitly-set None values via model_fields_set checks for label and queue_type, but the review field is missing this same elif branch. When a user explicitly passes review=None to a ProjectSyncEntry, the review key is silently omitted from the GQL input instead of being sent as None, which is inconsistent with how label and queue_type behave.

[lb-kamilk]

Expected