Remove all fields from the input stream except those that are specified. Use this processor to prune the input stream, keeping only the fields of interest.

information_source Note: The time field must be specified explicitly in order to keep it; otherwise you end up with timeless points.

keep fieldName1, fieldName2,...fieldNameN
Parameter Description Required?
fieldnameN The fields to propagate from input to output At least one

Example: Remove all fields except the a field, then log the remaining data points

emit -hz 10 -limit 10 
| put a = 1, b = 2 
| keep a 
| view text