Commits on Nov 24, 2021

1. scheduler: fix panic in system jobs when nodes filtered by class …

   In the system scheduler, if a subset of clients are filtered by class,
   we hit a code path where the `AllocMetric` has been copied, but the
   `Copy` method does not instantiate the various maps. This leads to an
   assignment to a nil map. This changeset ensures that the maps are
   non-nil before continuing.
   
   The `Copy` method relies on functions in the `helper` package that all
   return nil slices or maps when passed zero-length inputs. This
   changeset to fix the panic bug intentionally defers updating those
   functions because it'll have potential impact on memory usage. See
   #11564 for more details.

   

   tgross committed Nov 24, 2021
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