Copy Fields

Overview

The Copy Fields processor copies values from one field path to another without removing the original field.

Supported types: Logs

Basic Configuration

Parameter	Type	Default	Required	Description
ottl_expression	string	none	No	OTTL expression used to conditionally apply the field copying.

Rules

When building the ottl_expression, the UI exposes rule-based conditions.

Attributes

Parameter	Type	Description
Attribute Key	string	The attribute key to evaluate. Supported values: attribute; resource; log; span; metric (fields: aggregation_temporality; description; is_monotonic; name; type; unit); datapoint (fields: count; negative.offset; positive.offset; scale; sum; value_double; value_int; zero_count)
Operator	string	The operator to use for comparison. Supported values: equals; not equals; starts with; ends with; contains; regex; ==; !=; <; >; >=; <=; is boolean; is integer; is double; is map; is string; exists; not exists
Value	string	The value to compare against

Note: Multiple rules can be combined in the UI using logical operators such as AND or OR, and the resulting rule set is converted into the final ottl_expression.

Fields To Copy

Each item in fields defines one copy operation.

Parameter	Type	Default	Required	Description
from_field_type	string	none	Yes	Source location to copy from. Supported values: body attribute resource.
from_field	string	none	Yes	Source field key.
to_field_type	string	none	Yes	Destination location to copy to. Supported values: body attribute resource.
to_field	string	none	Yes	Destination field key.

Note: Copying leaves the original field unchanged.

Example Configuration

{
  "ottl_expression": "", // default: none
  "fields": [
    // required
    {
      "from_field_type": "attribute", // required, default: none
      "from_field": "", // required, default: none
      "to_field_type": "body", // required, default: none
      "to_field": "", // required, default: none
    },
  ],
}