show tag values from CPU_ALL with key="host"
SHOW TAG VALUES FROM "DISKREAD" WITH KEY = "name" WHERE host =~ /$host/
SHOW TAG VALUES FROM "CPU_ALL" WITH KEY = "host"

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show tag values from CPU_ALL with key="host"
SHOW TAG VALUES FROM "DISKREAD" WITH KEY = "name" WHERE host =~ /$host/
SHOW TAG VALUES FROM "CPU_ALL" WITH KEY = "host"