Python labels don't appear to follow threads

I'm working on tracking down a redis usage issue in a multi-threaded application so I wrapped several calls to redis_client.get with various labels in python 3.7, but it's not correctly filtering my stack traces. For instance this block
```
with pyroscope.tag_wrapper({ "redis": "my_listener.one_loop" }):
self.overall_status = self.redis_client.get(RedisKeys.overall_status_key)
```
should only return a trace for calls to redis/client.py, but it seems to just grab the entire applications stack trace during that time across all open threads