How do a send a slack alert if there the code in a sensor fails?

To send a Slack alert if the code within a sensor fails, you would typically handle exceptions within the sensor's code and use a Slack client to send a message when an exception is caught. Here's a conceptual example based on the documentation:

python
from dagster import sensor, RunRequest, SkipReason
from slack_sdk import WebClient
from slack.errors import SlackApiError

@sensor(job=my_job)
def my_sensor(context):
    try:
        # Your sensor logic here
        # For example, checking some condition
        if some_condition_is_true:
            yield RunRequest(run_key="run_key_for_this_condition", run_config={})
        else:
            yield SkipReason("Condition was not true")
    except Exception as e:
        # Handle the exception and send a Slack alert
        try:
            slack_client = WebClient(token="your-slack-api-token")
            slack_client.chat_postMessage(
                channel="#your-slack-channel",
                text=f"An error occurred in the sensor: {str(e)}"
            )
        except SlackApiError as slack_error:
            # Handle exceptions for Slack API errors
            print(f"Failed to send Slack message due to {slack_error.response['error']}")

In this example, you would replace

my_job

with the actual job you're targeting,

some_condition_is_true

with the actual condition you're checking, and fill in the

your-slack-api-token

and

#your-slack-channel

with your actual Slack API token and the channel you want to send the message to. Please note that this is a conceptual example and you would need to adapt it to your specific use case and error handling requirements. Additionally, ensure that you have the

slack_sdk

installed in your environment and that you handle any potential errors that could occur when sending the message to Slack. How to create a sensor for alerting on a... button Dagster Docs button How can I test that a failing job trigge... button Create alerts within the dagster UI button Thank you for your feedback!