fix(ingest/powerbi): emit lineage for paginated reports with embedded RDL datasources

[alfiyas-datahub]

Summary

PowerBI paginated reports (RDL) that connect directly to a SQL Server / Oracle / PostgreSQL / OleDb backend instead of a shared PowerBI dataset were silently emitting zero upstream lineage. The connector treats every report the same and only resolves lineage via report.dataset_id, which the workspace scan API never returns for embedded RDL datasources. Result: 0/N paginated reports get a datasetEdges aspect, with no warning in the ingestion report.

This PR adds a fallback path that calls GET /groups/{groupId}/reports/{reportId}/datasources for PaginatedReports without a dataset_id, and turns the returned datasourceType + connectionDetails.{server,database} into upstream datasetEdges using the existing platform-mapping machinery (SupportedDataPlatform, server_to_platform_instance).

What changes

• New ReportDatasource dataclass + Report.datasources field for the new payload (data_classes.py).
• New Constant.REPORT_DATASOURCES endpoint key and get_report_datasources() on DataResolverBase, with a regular-API implementation and an admin-API no-op (config.py, data_resolver.py). PowerBI doesn't expose an admin variant of this endpoint, so admin_apis_only deployments get an empty list.
• New branch in PowerBiAPI.get_reports() that only fetches /datasources for PaginatedReports without a dataset_id, so zero extra HTTP traffic for any existing code path (powerbi_api.py).
• New paginated_report_datasource_urns() helper that maps each ReportDatasource to a DataHub URN via SupportedDataPlatform + server_to_platform_instance, and folds the URNs into the existing dataset_edges set in report_to_datahub_work_units() (powerbi.py). No new aspect type, no new MCP shape - the lineage rides the same DashboardInfo.datasetEdges path regular reports use today.
• New structured Missing Lineage For Paginated Report info event so silent skips surface in the ingestion report. The existing Missing Lineage For Report event only fires when dataset_id is present but unresolvable, which is why this bug class has been invisible.
• New integration test test_powerbi_paginated_report_rdl_lineage + dedicated mock fixture covering exactly the bug-case shape (no datasetId, with /datasources returning SQL Server connection details).

Observability

After this change, every paginated report that doesn't resolve to upstream lineage produces a structured info event:

• Missing Lineage For Paginated Report - report has no dataset_id and /datasources returned nothing (admin-only mode, permission gap, or genuinely empty)
• Unmapped Paginated Report Datasource - /datasources returned a datasourceType that has no entry in SupportedDataPlatform (e.g., a Microsoft-only type we haven't mapped yet)

Both messages name the report and (where applicable) the server so operators can diagnose missing lineage without re-reading the connector source.

[codecov]

Codecov Report

❌ Patch coverage is 46.93878% with 26 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...on/src/datahub/ingestion/source/powerbi/powerbi.py	7.69%	12 Missing ⚠️
...ion/source/powerbi/rest_api_wrapper/powerbi_api.py	11.11%	8 Missing ⚠️
...n/source/powerbi/rest_api_wrapper/data_resolver.py	25.00%	6 Missing ⚠️

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[treff7es]

The test calls:

read_mock_data(
    pytestconfig.rootpath
    / "tests/integration/powerbi/mock_data/paginated_report_rdl_datasources.json"
)

read_mock_data does a plain open() with no fallback. The file paginated_report_rdl_datasources.json is not in the PR. Every CI run will raise FileNotFoundError before a single assertion executes. This is an unconditional blocker — the test cannot pass.

Fix: Add the mock JSON file to tests/integration/powerbi/mock_data/ in the PR.

[codecov]

Codecov Report

❌ Patch coverage is 95.94595% with 3 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...on/src/datahub/ingestion/source/powerbi/powerbi.py	88.88%	2 Missing ⚠️
...ion/source/powerbi/rest_api_wrapper/powerbi_api.py	95.23%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[datahub-connector-tests]

Connector Tests Results

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