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Gets memcache statistics for this application.

All of these statistics may reset due to various transient conditions. They provide the best information available at the time of being called.

Dictionary mapping statistic names to associated values. Statistics and their associated meanings:

hits: Number of cache get requests resulting in a cache hit. misses: Number of cache get requests resulting in a cache miss. byte_hits: Sum of bytes transferred on get requests. Rolls over to zero on overflow. items: Number of key/value pairs in the cache. bytes: Total size of all items in the cache. oldest_item_age: How long in seconds since the oldest item in the cache was accessed. Effectively, this indicates how long a new item will survive in the cache without being accessed. This is not the amount of time that has elapsed since the item was created.

On error, returns None.