Indicate number of steps in a dynamic job when using map

[dagsir]

Issue from the Dagster Slack

This issue was generated from the slack conversation at: https://dagster.slack.com/archives/C01U5LFUZJS/p1676934262622809?thread_ts=1676934262.622809&cid=C01U5LFUZJS

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Conversation excerpt

U03JNASG5RC: It would be a nice to have addition if Dagit would show the total count of dynamic jobs when using map. You can get this information but having it clearly visible would be nice. Alternatively showing in advance all the nodes would work too, at the moment it only shows the running nodes.
U028M11QNDD: Thanks Chris for the feedback! Agree that this would be nice--I'd recommend filing an issue for this so we can add it to our backlog
U03JNASG5RC: <@U018K0G2Y85> issue Indicate number of ops in a dynamic job when using map

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Message from the maintainers:

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[bengotow]

Hey folks! Thanks for filing this -- right now, Dagster doesn't know before the run starts how many instances of a dynamic output will exist, so we can't show the number in advance. We actually see the steps kick off and add boxes as they're arriving.

I think if the .map emitted some sort of log message indicating how many it was going to start we might be able to show the boxes moments earlier, but still not before the job is launched.