"Title:","'logstash-worker18.openstack.org - Used Space - /'" "Vertical Label:","'bytes'" "Start Date:","2017-10-20 00:00:00" "End Date:","2017-10-21 00:00:00" "Step:","86400" "Total Rows:","1" "Graph ID:","1818" "Host ID:","81" "" "Date","Total","Used" "1970-01-01 00:00:00","NaN","NaN"