one slack thread per Freight? sharing state between Stages?

[voidlily]

What I'm trying to do is post a Slack thread per Freight, which encompasses deployment to multiple stages. In the simplest possible case what I'm trying to do is the following:

I have a project with 2 Stages, staging and prod.

New slack message: "Starting deploy of xyz to staging"
Reply in thread: "Deploy to staging complete"
Reply in thread: "Starting deploy to prod"
Reply in thread: "Prod deploy complete"

https://api.slack.com/messaging/webhooks
https://docs.kargo.io/user-guide/reference-docs/promotion-steps/http/#posting-to-slack

With Slack webhooks this is done by setting thread_ts to the ts value returned by the original message. This works fine for the initial staging deploy because you can store the output of the starting_deploy step, reference the ts in there to pass thread_ts. What's unclear to me is if there's a way to pass the ts from the staging State, to the prod Stage. It doesn't look like you necessarily can right now though, and I could see it being useful especially for a more complicated deploy with multiple Stages, and then you can have one thread per Freight with all the steps it entails while minimizing slack spam.

[Brightside56]

You could probably use https://docs.kargo.io/user-guide/reference-docs/promotion-steps/set-metadata to check if freight has ts metadata, if not - set it, if yes - use it and post in thread