[v23.2.x] c/s/leader_balancer: prevent oversized alloc #15873
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When there are many topics within in a system we can get oversized allocations, so switch to a btree_map. Signed-off-by: Tyler Rockwood <rockwood@redpanda.com> (cherry picked from commit c892e63)
rockwotj
approved these changes
Dec 22, 2023
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Backport of PR #15862