In the req-reply microservice scenario, the cache hit rate is very low

[chenjpu]

http://127.0.0.1:8222/subsz

{
  "num_subscriptions": 59,
  "num_cache": 222,
  "num_inserts": 59,
  "num_removes": 0,
  "num_matches": 237,
  "cache_hit_rate": 0.06329113924050633,
  "max_fanout": 1,
  "avg_fanout": 0.9954954954954955
}