Protobuf definitions for use in recipes and recipe modules. e.g:
from PB.foo.proto import Foo
Retrieve https://chromium.googlesource.com/infra/luci/luci-go.git and copy the proto from it. E.g.
cp ${LUCI}/milo/api/config/project.proto go.chromium.org/luci/milo/api/config
As a general note, only add the ones that are not already in recipes-py at https://chromium.googlesource.com/infra/luci/recipes-py.git/+/main/recipe_proto/