While brainstorming on #30536, it appeared that the current tag for identifying the cache manager for a given cache metrics is a bit misleading.
It currently is cacheManager, which would give cache.manager if the recommendations were applied. For one, it really represents the name of the cache manager, not the cache manager itself. The only reason this tag exists is to differentiate two caches that would have the same name. It can only happen if these caches are managed by two cache managers as a single cache manager indexes caches by their names.
We've discussed some alternatives such as managed.by, or manager.name perhaps? In any case, this value is quite "spring specific" in the end and it would be nice if we could surface it in a way that it is actionable for the consumer of the metrics (i.e. qualifier in case there are more than one cache with that name, or for focusing on metrics from a particular cache backend).