I'm seeing a issue where pants can't infer a dependency for two libraries, urllib3 and certifi

pants dependencies --transitive observatory_api/observatory_api/rest.py 
15:40:27.93 [WARN] The target observatory_api/observatory_api/rest.py imports `certifi`, but Pants cannot safely infer a dependency because more than one target owns this module, so it is ambiguous which to use: ['.build/requirements#certifi', 'observatory_api:reqs#certifi'].

Please explicitly include the dependency you want in the `dependencies` field of observatory_api/observatory_api/rest.py, or ignore the ones you do not want by prefixing with `!` or `!!` so that one or no targets are left.

Alternatively, you can remove the ambiguity by deleting/changing some of the targets so that only 1 target owns this module. Refer to <https://www.pantsbuild.org/v2.15/docs/troubleshooting#import-errors-and-missing-dependencies>.
15:40:27.93 [WARN] The target observatory_api/observatory_api/rest.py imports `urllib3`, but Pants cannot safely infer a dependency because more than one target owns this module, so it is ambiguous which to use: ['.build/requirements#urllib3', 'observatory_api:reqs#urllib3'].

I'm unsure where the observatory_api:reqs target is coming from.

The error message suggests there might be a

observatory_api/BUILD

file. What's in it?

Magic!

Our work repo has found success by making sure there's only one

python_requirements

in a single resolve, so that dependencies aren't imported twice. There's coincidentally a thread a few days ago about something similar: https://pantsbuild.slack.com/archives/C046T6T9U/p1677806156563409