Change the balanced partition criteria in scaling up DTs #7768
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The assessment whether partitions are balanced were done by comparing the number of partitions in each node with the average target ±20%. This way went broken with the introduction of partition balancing domains. The criteria is changed by this commit to make sure that the number of partitions across noded is levelled within a scope of each domain separately. Levelled means that min and max # of replicas differ by 1 at most. Re redpanda-data#7418
dlex
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The assessment whether partitions are balanced were done by comparing the number of partitions in each node with the average target ±20%. This way went broken with the introduction of partition balancing domains. The criteria is changed by this commit to make sure that the number of partitions across noded is levelled within a scope of each domain separately. Levelled means that min and max # of replicas differ by 1 at most.
Fixes #7418
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