chore: import upstream snapshot with attribution

.github/workflows/tracing.yml

@@ -0,0 +1,84 @@
+name: Tracing SDK Test
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    paths-ignore:
+      - "docs/**"
+      - "**.md"
+      - "dev/clint/**"
+      - ".github/workflows/docs.yml"
+      - ".github/workflows/preview-docs.yml"
+      - "mlflow/server/js/**"
+      - ".github/workflows/js.yml"
+      - ".claude/**"
+  push:
+    branches:
+      - master
+      - branch-[0-9]+.[0-9]+
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref }}
+  cancel-in-progress: true
+
+# Use `bash` by default for all `run` steps in this workflow:
+# https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#defaultsrun
+defaults:
+  run:
+    shell: bash
+
+env:
+  MLFLOW_HOME: /home/runner/work/mlflow/mlflow
+  MLFLOW_CONDA_HOME: /usr/share/miniconda
+  PYTHONUTF8: "1"
+  MLFLOW_SERVER_ENABLE_JOB_EXECUTION: "false"
+  PIP_CONSTRAINT: ${{ github.workspace }}/requirements/constraints.txt
+
+permissions: {}
+
+jobs:
+  core:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    timeout-minutes: 30
+    if: github.event_name != 'pull_request' || (github.event.pull_request.draft == false || github.event.pull_request.user.login == 'Copilot' && github.event.pull_request.user.type == 'Bot')
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - uses: ./.github/actions/setup-python
+
+      # Install mlflow-tracing SDK from the current directory
+      - name: Install mlflow-tracing SDK
+        run: |
+          uv pip install --system setuptools --upgrade
+          uv pip install --system ./libs/tracing
+
+      - name: Install test dependencies
+        run: |
+          uv pip install --system pytest pytest-asyncio pytest-timeout litellm
+
+      - name: Run core tracing tests
+        # NB: OTLP exporter includes large dependencies, so we want to test it in a separate job
+        #     to avoid overlooking unnecessary dependencies in the core tracing package.
+        run: |
+          export PYTHONPATH=$(pwd)
+          pytest tests/tracing \
+            --ignore tests/tracing/utils/test_otlp.py \
+            --ignore tests/tracing/test_assessment.py \
+            --ignore tests/tracing/test_otel_logging.py \
+            --ignore tests/tracing/processor/test_otel_metrics.py \
+            --ignore tests/tracing/opentelemetry/test_integration.py \
+            --ignore tests/tracing/test_otel_loading.py \
+            --import-mode=importlib
+
+  # TODO: Add a job to run autologging tests against integrated libraries (latest versions)
+
+  # TODO: Add a job to warn large package size increase.
+  # package-size:
+
+  # TODO: Add a job to test OTLP export