User Story (Required on creation):

As a user, I can gain insights on how long external tasks were waiting before being processed.

Functional Requirements (Required before implementation):

The external task log contains information about when a task was locked and if a lock expired.

Technical Requirements (Required before implementation):

• Lock event is written to the external task.
• Lock events can be fetched via Java, REST, and Open API
• Lock events are displayed in Cockpit
• Documentation exists.

Limitations of Scope (Optional):

Hints (optional):

Original Description

In the history tables for external tasks and jobs, it would be nice to be able to see entries for when an external task or job was locked. Currently, we can only see when these are created, completed, failed, deleted.

This is useful because it would allow us to report on how long a task or external job was waiting separately from its actual processing time.

Related forum thread: https://forum.camunda.org/t/external-tasks-history/6277