Problem/Motivation
Child issue of #2497243: Rebuilding service container results in endless stampede.
The chained fast cache backend currently invalidates caches using the cache itself. This means if multiple webheads with local fast backends are used, invalidations are not consistent across all webheads - in case NTP is not used. (The timestamp solution works, but an atomic counter that cache tags provide is better).
Proposed resolution
Use the cache tag invalidation provider to track cache invalidations.