RpcLoadBalancer.LoadBalancer.SelectionAlgorithm.LeastConnections
(rpc_load_balancer v0.3.6)
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Least connections node selection algorithm.
Tracks active connection counts per node using lock-free :counters and
always selects the node with the fewest active connections. When a call
completes, release_node/2 must be called to decrement the counter.
RpcLoadBalancer.call/5 and cast/5 with the :load_balancer option
handle this automatically.
Hot-path implementation uses CounterCache.get_node_count/2 (which
bypasses the telemetry wrapper) and a single-pass Enum.reduce/3 that
allocates one tuple instead of building an intermediate list.