Here is my Redis graph from graphite for the past 72 hours displaying current_keys.
as you may notice one instance ( green ) is dropping keys regularly, while other one is ok.. Both of them were configured with Chef and running same Redis version ( redis_version:2.6.5 ) and same config.
Any ideas what could cause keys to drop? Both instances are behind nutcracker/twemproxy ( redis proxy from Twitter https://github.com/twitter/twemproxy ) so should get equal amount of keys..