I created a sensor which should alert us on 1 of 2 slack channels (depending on whether we’re on prd or dev environment). this is where I defined the sensor

slack_failure_sensor = make_slack_on_run_failure_sensor(
    channel=f"#dagster-notifications-{os.getenv('RUNTIME_ENVIRONMENT')}",
    slack_token=os.getenv("DAGSTER_SLACK_TOKEN"),
    blocks_fn=get_error_blocks,
)

I checked that the daemon has those 2 environment variables set, here is the slack channel. I’m omitting the slack token of course, but it is set as well.

>>> import os
>>> print(f"#dagster-notifications-{os.getenv('RUNTIME_ENVIRONMENT')}")
#dagster-notifications-prd

When a pipeline fails I’m getting this error:

slack_sdk.errors.SlackApiError: The request to the Slack API failed. (url: <https://www.slack.com/api/chat.postMessage>)
The server responded with: {'ok': False, 'error': 'channel_not_found'}

any idea where I’m going wrong here? our slack has the channel `dagster-notifications-prd`I should also say that it works when I run it locally (run dagster & dagit & daemon on my laptop & make a job fail -> it posts on our slack)

Hi, is this in kubernetes or some other environment where you are building your code in an image? The daemon doesn't run your code directly - you would want to add dagster-slack to the image that you build your code in

the image is build in Google Cloud Build whenever we push to master. hmm, but then I don’t know what’s wrong.. because the image that’s running in

dagster-user-deployments

has

dagster-slack

installed

the error you posted looks like something on the slack API side, rather than dagster-slack not being installed

oh I see, I think

dagster-user-deployments

might actually be missing my

RUNTIME_ENVIRONMENT

environment variable. sorry thought that had to be set in the daemon