count

Return the number of points in the stream, optionally filtering on a specified field.

put|reduce count(field)

Parameter	Description	Required?
field	The field on which to filter If field is specified, then count returns the number of points containing that field. If unspecified, it returns the total number of points received.	No

Example

This example uses batching. See the batch processor for details about batching.

// On historical data, you can apply reducer to get a single computation,
// or batch your historical data by time, then reduce per batch period.

sub historical_points() {
  emit -from :0: -limit 10 
  | put cnt = count(), value = Math.random()
}
historical_points 
| reduce cnt = count() 
| view table -title "Historical total count"
;
historical_points 
| batch 5 
| reduce cnt = count(value) 
| view table 
    -update "append" 
    -title "Historical 5-second count"
;

// On live streaming data, you must batch by time, then reduce per batch period.

sub live_points() {
emit -limit 10 
| put cnt = count(), value = Math.random() 
}
live_points 
| batch 2 
| reduce cnt=count() 
| view table 
    -update 'append' 
    -title "Live 2-second count"