In the ratelimiting module, we make a "namespace" that includes "rate-limit" and the type of limiting that we're doing (ip address or auth'd user):
https://github.com/metabrainz/brainzutils-python/blob/c8fc6058389/brainzutils/ratelimit.py#L254
We also have a namespace function built into the cache module: https://github.com/metabrainz/brainzutils-python/blob/c8fc6058389/brainzutils/cache.py#L96
which will automatically prepend the namespace to the key name. We could use this functionality for the "rate-limit" part of the key namespace.