Delta

Delta (delta)

Convenience wrapper that enables stream delta mode with a slim option set.

Stateful Transform json

Minimal example

actions:
  - delta:
      watch: ""

JSON

{
  "actions": [
    {
      "delta": {
        "watch": ""
      }
    }
  ]
}

Contents

• Minimal example

• Behaviour

• General

• Input

• Output

Behaviour

Behaviour

Field	Type	Required	Description
only-changes ✓	boolean (bool)		Only emit deltas when the watched field changes. Default: false

General

General

Field	Type	Required	Description
description	string		Describe this step.
condition	lua-expression (string)		Only run this action when the Lua condition evaluates to true. Examples: 2 * count()

Input

Input

Field	Type	Required	Description
watch	field (string)	✅	Field whose numeric value should be differenced. Examples: data_field
group-by	field (string)		Group state independently per key. Examples: data_field
input-time	field (string)		Field containing event time for elapsed calculations. Examples: data_field

Output

Output

Field	Type	Required	Description
marker	string		Optional marker applied to emitted delta events.
output-field	field (string)		Field name where the delta is written. Examples: data_field
elapsed-field	field (string)		Field name where elapsed milliseconds are written. Examples: data_field