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This exposes the collected metrics we store for ARS in the nodes stats, as well
as the computed rank of nodes. Each node exposes its perspective about the
cluster.
Here's an example output (with `?human`):
```json
...
"adaptive_selection" : {
"_k6v1-wERxyUd5ke6s-D0g" : {
"outgoing_searches" : 0,
"avg_queue_size" : 0,
"avg_service_time" : "7.8ms",
"avg_service_time_ns" : 7896963,
"avg_response_time" : "9ms",
"avg_response_time_ns" : 9095598,
"rank" : "9.1"
},
"VJiCUFoiTpySGmO00eWmtQ" : {
"outgoing_searches" : 0,
"avg_queue_size" : 0,
"avg_service_time" : "1.3ms",
"avg_service_time_ns" : 1330240,
"avg_response_time" : "4.5ms",
"avg_response_time_ns" : 4524154,
"rank" : "4.5"
},
"DHNGTdzyT9iiaCpEUsIAKA" : {
"outgoing_searches" : 0,
"avg_queue_size" : 0,
"avg_service_time" : "2.1ms",
"avg_service_time_ns" : 2113164,
"avg_response_time" : "6.3ms",
"avg_response_time_ns" : 6375810,
"rank" : "6.4"
}
}
...
```