redis: change expired_keys type from GAUGE to DERIVE
authorMarc Fournier <marc.fournier@camptocamp.com>
Sat, 27 Feb 2016 23:58:01 +0000 (00:58 +0100)
committerMarc Fournier <marc.fournier@camptocamp.com>
Sat, 27 Feb 2016 23:58:01 +0000 (00:58 +0100)
Thanks for @falzm for pointing this out in #1483 !


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