The cache statistics is to contain provisional cumulative as well as derived data including:

• "misses" as the total attempts to retrieve data from the cache with unattainable responses, forcing a direct repository (DB, triple-store etc.) retrieval
• "deletes" as the total amount of cache eviction operations (either through a purge or query dependency)
• "hits" contains the amount of cache retrievals from either embedded (queries called from within a wiki page) or non-embedded (if enabled, requested by pages like Special:Ask or the API) sources
• "medianRetrievalResponseTime" is an orientation value of the median response time (in sec.) for cached and non-cached retrieval requests over the time span of the collection process
• "noCache" indicates the amount of no attempt requests (limit=0 queries, 'no-cache' option etc.) to retrieve results from cache