head | Juttle Language Reference
Only emit the first limit points from each batch.
head limit [by groupfield1, [groupfield2, ...]]
||The number of points to emit; may be an expression that evaluates to an integer||No; defaults to 1|
||One or more fields by which to group. See Grouping fields with by.||No|
Example: Generate batches containing ten points each but only log the first two points from each batch