Exclude specific dates to not run workflow on (ex. holidays/non-working days).

[steffenneyt]

Summary

Functionality to not run workflow(s) on certain dates. Like the holiday feature that SOS Berlin's jobscheduler has.

Use Cases

For example when you or your company has fixed holidays/non-working days when you do not want certain workflow(s) to run.

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[nihar-13]

+1 on this feature.

BTW, it is available in Argo Events - not in workflows.
Its a good thing to have to be able to compete with schedulers in market.

[tooptoop4]

dupe of #8347

[agilgur5]

dupe of #8347

That issue is specific to CronWorkflows -- I'm actually unsure if this one was intended to be for CronWorkflows as it doesn't say, or if it was instead intended to be for all Workflows controller-wide, such as #7868 but for any Workflows.

It's probably the former, but not sure.

Also for CronWorkflows for specific dates without a specific calendar as #8347 explicitly says, when of #13474 makes that possible now

[nihar-13]

Most of the times, workflows are triggered by an external event or trigger. Hence adding specific calendar-checks don't make much sense there. If there are such cases, those are covered by "when clause". Do you think we can add "when" to Workflows?

For CronWorkflows, which are set-once-and-forget, having date-based configurations make more sense. Having explicit parameters to store actual holiday dates (example: 20240101, 20241225, 20250101, 20251225, etc.) gives a more "scheduler-like" feeling. But sourcing it from any external "config-map" should also be equally good, if its latest value can be referred before each execution of cron workflow schedule.

[agilgur5]

Do you think we can add "when" to Workflows?

That's existed for many years: https://argo-workflows.readthedocs.io/en/release-3.5/walk-through/conditionals/. The new CronWorkflows one is based on it.