[prism] Using Real Time, when operating in "production" mode.

[lostluck]

Set processing Time timers and ProcessContinuations to be scheduled via a Real Time clock for a "quasi production" mode.

Requires per-pipeline configuration to be plumbed into the Element manager to toggle this line:

https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/runners/prism/internal/engine/elementmanager.go#L1640

[github-actions]

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[lostluck]

@shunping Going to assign this to you, as it seems timely (pun intended).

[shunping]

I am debating which one is a better flag name, "enable_rtc" or "production_mode" (or "prod" for short)?

Any preference or other suggestion? @lostluck

[github-actions]

This issue has been marked as stale due to 150 days of inactivity. It will be closed in 30 days if no further activity occurs. If you think that’s incorrect or this issue still needs to be addressed, please simply write any comment. If closed, you can reopen the issue at any time. Thank you for your contributions.