Merge upstream/backpressure

Resolve merge conflicts by taking upstream versions, which represent the
refined evolution of local prototype backpressure work.

Co-Authored-By: Claude Code <[email protected]>

Author: Jibola

.codecov.yml

@@ -0,0 +1,4 @@
+# do not notify until at least 100 builds have been uploaded from the CI pipeline
+# you can also set after_n_builds on comments independently
+comment:
+  after_n_builds: 100

.evergreen/combine-coverage.sh

@@ -5,19 +5,12 @@
 
 set -eu
 
-. .evergreen/utils.sh
+# Set up the virtual env.
+. .evergreen/scripts/setup-dev-env.sh
+uv sync --group coverage
+source .venv/bin/activate
 
-if [ -z "${PYTHON_BINARY:-}" ]; then
-    PYTHON_BINARY=$(find_python3)
-fi
-
-createvirtualenv "$PYTHON_BINARY" covenv
-# Keep in sync with run-tests.sh
-# coverage >=5 is needed for relative_files=true.
-pip install -q "coverage[toml]>=5,<=7.5"
-
-pip list
 ls -la coverage/
 
-python -m coverage combine coverage/coverage.*
-python -m coverage html -d htmlcov
+coverage combine coverage/coverage.*
+coverage html -d htmlcov

.evergreen/config.yml

@@ -38,6 +38,7 @@ post:
   # Disabled, causing timeouts
   # - func: "upload working dir"
   - func: "teardown system"
+  - func: "upload codecov"
   - func: "upload coverage"
   - func: "upload mo artifacts"
   - func: "upload test results"

.evergreen/generated_configs/functions.yml

@@ -101,8 +101,8 @@ functions:
           - AUTH
           - SSL
           - ORCHESTRATION_FILE
-          - PYTHON_BINARY
-          - PYTHON_VERSION
+          - UV_PYTHON
+          - TOOLCHAIN_VERSION
           - STORAGE_ENGINE
           - REQUIRE_API_VERSION
           - DRIVERS_TOOLS
@@ -134,10 +134,10 @@ functions:
           - AWS_SECRET_ACCESS_KEY
           - AWS_SESSION_TOKEN
           - COVERAGE
-          - PYTHON_BINARY
+          - UV_PYTHON
           - LIBMONGOCRYPT_URL
           - MONGODB_URI
-          - PYTHON_VERSION
+          - TOOLCHAIN_VERSION
           - DISABLE_TEST_COMMANDS
           - GREEN_FRAMEWORK
           - NO_EXT
@@ -151,6 +151,7 @@ functions:
           - VERSION
           - IS_WIN32
           - REQUIRE_FIPS
+          - TEST_MIN_DEPS
       type: test
     - command: subprocess.exec
       params:
@@ -238,6 +239,40 @@ functions:
         working_dir: src
       type: test
 
+  # Test numpy
+  test numpy:
+    - command: subprocess.exec
+      params:
+        binary: bash
+        args:
+          - .evergreen/just.sh
+          - test-numpy
+        working_dir: src
+        include_expansions_in_env:
+          - TOOLCHAIN_VERSION
+          - COVERAGE
+      type: test
+
+  # Upload coverage codecov
+  upload codecov:
+    - command: subprocess.exec
+      params:
+        binary: bash
+        args:
+          - .evergreen/scripts/upload-codecov.sh
+        working_dir: src
+        include_expansions_in_env:
+          - CODECOV_TOKEN
+          - build_variant
+          - task_name
+          - github_commit
+          - github_pr_number
+          - github_pr_head_branch
+          - github_author
+          - requester
+          - branch_name
+      type: test
+
   # Upload coverage
   upload coverage:
     - command: ec2.assume_role