re-order metrics

Change-Id: I60e3de451c7250ee65d55978b88f7cd6fbe244da
Reviewed-on: http://review.couchbase.org/28602
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>