[rudycelekli]

Description

Register grpc.health.v1.Health Check/Watch for the overall server and OpenMedService. Successful actual runtime preload publishes SERVING; terminal drain notification and stop publish NOT_SERVING, including when preload finishes after drain.

Type of Change

• New feature
• Test addition/improvement
• Documentation update

Testing

• 11 focused offline tests and independent source review passed.
• Meaningful isolated negative controls reject changed required behavior.
• UV_NO_SYNC=1 UV_PROJECT_ENVIRONMENT=<shared Python 3.12 environment> PYTHONPATH=$PWD make format lint format-check type-check
• Full Python 3.12.11 suite: 29557 passed, 190 skipped, 24 warnings in 847.18s (0:14:07). Command: $OPENMED_TEST_ENV/bin/python -m pytest tests/ -q with explicit worktree PYTHONPATH.
• Staged gitleaks scan with repository configuration and baseline passed.

Documentation

• Public docstrings, documentation and CHANGELOG updated.
• New documentation pages have matching navigation/publication classification where applicable.

Code Quality

• Canonical formatter, lint/effect-path checks, formatting verification and scoped type checks.
• Focused source review and scoped commit.

Dependencies

Pin grpcio-health-checking==1.81.1 in dev/service extras: upstream Apache-2.0 implementation of the standard health protocol. This matches the committed generated OpenMed stubs and existing lock versions. uv.lock adds only four requirement links; no package pins change. Core and Triton dependency groups stay unchanged.

Checklist

• Read contributing, code-of-conduct and maintainer guidance.
• Linked maintainer issue and kept this change focused on its independent scope.

Related Issues

Closes #3917

Scope and example

Listener credentials and binding policy remain with #3546, coordinated admission/drain with #3576. Actual tests exercise ephemeral loopback and TLS listeners; no cluster deployment is claimed.