def METHOD_NAME(target):
    # type: (Target) -> Optional[DownloadObserver]
    if not isinstance(target, (AbbreviatedPlatform, CompletePlatform)):
        return None
    analyzer = _Issue10050Analyzer(target.platform)
    patches = []
    patches_dir = safe_mkdtemp()
    patched_environment = target.marker_environment.as_dict()
    with open(os.path.join(patches_dir, "markers.json"), "w") as markers_fp:
        json.dump(patched_environment, markers_fp)
    patches.append(
        Patch.from_code_resource(__name__, "markers.py", _PEX_PATCHED_MARKERS_FILE=markers_fp.name)
    )
    compatible_tags = target.supported_tags
    if compatible_tags:
        patches.append(patch_tags(compatible_tags=compatible_tags, patches_dir=patches_dir))
    assert (
        target.marker_environment.python_full_version or target.marker_environment.python_version
    ), (
        "A complete platform should always have both `python_full_version` and `python_version` "
        "environment markers defined and an abbreviated platform should always have at least the"
        "`python_version` environment marker defined. Given: {target}".format(target=target)
    )
    requires_python = (
        "=={full_version}".format(full_version=target.marker_environment.python_full_version)
        if target.marker_environment.python_full_version
        else "=={version}.*".format(version=target.marker_environment.python_version)
    )
    patches.append(
        patch_requires_python(requires_python=[requires_python], patches_dir=patches_dir)
    )
    TRACER.log(
        "Patching environment markers for {} with {}".format(target, patched_environment),
        V=3,
    )
    return DownloadObserver(analyzer=analyzer, patch_set=PatchSet(patches=tuple(patches)))