The "set" list type was chosen because it seemed appropriate (no duplicates!)
but that made tracking of managed fields more expensive (each entry in the list
is tracked, not the entire field) and for no good reason (one client is
responsible for the entire list).
Therefore the type gets changed to "atomic". Server-side-apply has not been
used in the past and PodSchedulingContext objects are short-lived and still in
alpha, so the any potential compatibility issues should be minor.
The scheduling throughput in scheduler_perf increases:
name old SchedulingThroughput/Average new SchedulingThroughput/Average
PerfScheduling/SchedulingWithResourceClaimTemplate/2000pods_100nodes-36 18.8 ± 8% 24.0 ±37%
PerfScheduling/SchedulingWithMultipleResourceClaims/2000pods_100nodes-36 13.7 ±81% 18.5 ±40%
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