In Prefect 2.x, events are automatically emitted by various Prefect objects including flows, tasks, deployments, work queues, and logs. You can also emit custom events using the Prefect SDK by making use of the
emit_event
method to send events to the Prefect events API. For instance, the following Python code emits an event:
python
from prefect.events import emit_event
def some_function(name: str="kiki") -> None:
print(f"hi {name}!")
emit_event(event=f"{name}")
Regarding designing event handlers without using a YAML file, there is no direct information from the documents retrieved. However, I can gather that the event handlers configured in Prefect are tied to automations which are often defined in the Prefect Cloud UI or via code. Typically, Prefect Cloud provides an interactive dashboard for analyzing and taking action on events, thus allowing you to define your event handlers through the UI instead of using a YAML file.
To create custom event handlers programmatically, you would generally define the logic inside your Prefect flows or tasks, set up automations in the UI, or use the Prefect API, depending on what exactly you are trying to achieve.
If you are looking for more specific information about implementing custom event handlers in code without using a YAML file, please let me know, and I can look for more detailed instructions or examples.
