[Core feature] Support warnings in task outputs about flyte HOT 2 OPEN

To implement warnings in task outputs in Flyte, consider using a custom output type that includes a warnings field. This approach allows tasks to return both their primary outputs and any warnings. Modify the task's signature to include a warnings list and ensure these are displayed in the Flyte console. Here’s an example using Python:

from typing import List, Tuple
from flytekit import task, workflow

@task
def example_task() -> Tuple[str, List[str]]:
    warnings = []
    # Example condition that triggers a warning
    if True:
        warnings.append("This is a warning message.")
    return "Task completed successfully.", warnings

@workflow
def example_workflow() -> Tuple[str, List[str]]:
    result, warnings = example_task()
    return result, warnings

This code defines a task that returns a tuple of a result and a list of warnings. The workflow captures and returns both. Adjust the UI to display these warnings appropriately.

Would you like more details on integrating this with the Flyte UI or any other aspect?

Sources:

• https://discuss.flyte.org/t/9499661/hello-does-anyone-know-why-i-am-seeing-the-cache-was-disable/
• https://discuss.flyte.org/t/16645914/is-there-a-way-to-propogate-some-important-output-to-a-flyte/

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from flyte.

This is related to an old discussion: #3838.

We also talked about this and the naive solution to add another file (e.g. warnings.pb) to describe these special warnings can lead to a performance hit, so it's undesirable.

from flyte.