Delete hosts data is not working

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I want to delete some hosts that I’m not using anymore because show up on grafana with templates and I don’t want that.

I execute drop series from measurement where host = 'hostName'
Then I execute show series from measurement

The host still there. Any idea?

drop series from cpu where host = 'hostName'
show series from cpu where host = 'hostName'
cpu,cpu=cpu-total,host=hostName
cpu,cpu=cpu0,host=hostName
cpu,cpu=cpu1,host=hostName