pika 添加命中率指标

[huxiaozhe]

Which PikiwiDB functionalities are relevant/related to the feature request?

No response

Description

keyspace_hits:711364981104
keyspace_misses:10870411985
与 redis 的命中 miss指标保持一致，方便业务侧更加直观的看到自己的命中率。

Proposed solution

pika 中可以使用原子操作进行计算

Alternatives considered

[luky116]

柏韬处理

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Bertolt Processing

[chenbt-hz]

@luky116 确认下。这个issue需要添加的是：查询命令是否成功查找到key，与pika cache的统计无关。
即，执行查询命令当key能正确返回时keyspace_hits加一，否则keyspace_misses加一。
参考 https://redis.io/commands/info/

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@luky116 Confirm. What needs to be added to this issue is: whether the query command successfully finds the key has nothing to do with the statistics of pika cache.
That is, when the query command is executed and the key can be returned correctly, keyspace_hits is increased by one, otherwise keyspace_misses is increased by one.
Reference https://redis.io/commands/info/