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Matt writes: The coupled deadtime idea didn't work.  So, this should make the transition respect deadtime per readout group (some might get it and some might not).

Mona writes about psana2: eventbuilder requires that all non-L1 have to be complete (i.e. all streams need to see SlowUpdate)

Brainstorming

Issue: SlowUpdate currently preempts L1Accept, so integrating detectors miss their normalization data

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