Based on the research and module exploration, here's what you need to know about task started events in Prefect: 1. There isn't a specific "task started" event in the traditional sense. Instead, Prefect uses a state-based system where tasks transition through different states. 2. When a task begins execution, it transitions to the "RUNNING" state. You can observe and react to these state changes in several ways: 3. The main approaches to handle task state changes are: a. Using state change hooks on your tasks:

python
   from prefect import task
   
   @task(on_running=lambda task, context: print(f"Task {task.name} is starting!"))
   def my_task():
       pass

b. Using the events system to emit custom events:

python
   from prefect.events import emit_event
   
   @task
   def my_task():
       emit_event(
           event="task-started",
           resource={"prefect.resource.id": "my-task"},
           payload={"message": "Task is starting"}
       )
       # task logic here

4. You can also monitor task states through: - The Prefect UI - The Prefect API - State queries in your code - Prefect's logging system If you need to track when tasks start, I'd recommend either using state change hooks or emitting custom events depending on your specific use case. Would you like me to elaborate on any of these approaches? Links: - Task States Documentation - Events Documentation