Commits on May 15, 2023

1. scheduler: prevent -Inf in spread scoring …

   When spread targets have a percent value of zero it's possible for them to
   return -Inf scoring because of a float divide by zero. This is very hard for
   operators to debug because the string "-Inf" is returned in the API and that
   breaks the presentation of debugging data.
   
   Most scoring iterators are bracketed to -1/+1, but spread iterators do not so
   that they can handle greatly unbalanced scoring so we can't simply return a -1
   score without generating a score that might be greater than the negative scores
   set by other spread targets. Instead, track the lowest-seen spread boost and use
   that as the spread boost for any cases where we'd divide by zero.
   
   Fixes: #8863

   

   tgross committed May 15, 2023
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