backend/src/main/resources/file/template.csv

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Time,root.group1.dev.s1,root.group1.dev.s2,root.group2.dev.s
1,100,150,300
3,200,300,320
10,300,,400
(Before importing data from this file, delete the license comments and the following contents.)
CSV file format:
    The file is split with ",", and the first column is "Time" on the first line, followed by the measurement name.
    The first column from the second row is the timestamp, followed by the imported data.
    If you do not need to import data for certain measurement at certain timestamps, do not enter them. Refer to line 4 of this file.
    The timestamp format can be number, yyyy-MM-dd'T'HH:mm:ss, yyyy-MM-dd HH:mm:ss, yyyy-MM-dd'T'HH:mm:ss.SSS and so on.
    The timestamp format and column number of each row must be the same.
    Note:fields containing , should be escaped by \.
You can use the export CSV tool to export data to get more templates.