Redirect Loops on JSON API endpoints.

All purges of JSON API documents have completed. Our backends are recovering from the added load of repopulating the entire cache. Any failed purges may result in latent redirect loops for specific projects or releases in the JSON API, these will self-resolve within 24 hours as caches expire.

The cache purge has cleared all but projects starting with the letter `p`. Our estimates failed to take into consideration the popularity of project names on PyPI starting with p 🙃

Our mass purge operation is continuing. Based on the current rate that we're able to process all purges the processes should be complete in 45-60 minutes.

We have started a task which will iterate over all projects and purge the cache for each individually. This will keep the PyPI backends from being overloaded by a completely bare cache. This process will take some time to complete, current estimate is 1-2 hours.

Some cached responses are causing redirect loops for endpoints on the JSON API. We are working to determine how to clear these cached values without impacting the overall health of PyPI.