## Object caching

Object caching by turned on by default with following settings

 - Default cache size 8GB. Cache size also automatically picks
   a lower value if your local memory size is lower than 8GB.

 - Default expiration of entries happensat 72 hours,
   this option cannot be changed.

 - Default expiry interval is 1/4th of the expiration hours, so
   expiration sweep happens across the cache every 1/4th the time
   duration of the set entry expiration duration.

### Behavior

Caching happens on both GET and PUT operations.

- GET caches new objects for entries not found in cache.

- PUT/POST caches all successfully uploaded objects.

In all other cases if objects are served from cache.

NOTE:

Cache is always populated upon object is successfully
read from the disk.

Expiration happens automatically based on the configured
interval as explained above, frequently accessed objects
stay alive for significantly longer time due to the fact
that expiration time is reset for every cache hit.

## Object Caching

Object caching is on by default with following settings

 - Cache size is 50% of your RAM size. Caching is disabled
   if your RAM size is smaller than 8GB.

 - Expiration of each entries happen on every 72 hours.

 - Garbage collection sweep of the expired entries happen every
   1/4th the set expiration hours value (every 18 hours).

NOTE: None of the settings can be configured manually.

### Behavior

Caching happens on both GET and PUT operations.

- GET caches new objects for entries not found in cache.
  Otherwise serves from the cache.

- PUT/POST caches all successfully uploaded objects. Replaces
  existing cached entry for the same object if needed.

NOTE: Expiration happens automatically based on the configured
interval as explained above, frequently accessed objects stay
alive in cache for a significantly longer time on every cache hit.

Fix caching docs to comply with current features.
docs: Fix caching docs to comply with current features.
