yswdqz commented on PR #12458:
URL: https://github.com/apache/skywalking/pull/12458#issuecomment-2232240340
> @yswdqz Could you check the `pg service hit rate`, it is greater than
100%, is it expected?
>
No, seems a bug. I'm sorry I don't have time at the moment, can you try to
modify：
``` mal
before:
- name: cache_hit_rate
exp: (pg_stat_database_blks_hit*100 / (pg_stat_database_blks_read +
pg_stat_database_blks_hit)).sum(['service_instance_id','host_name'])
after:
- name: cache_hit_rate
exp: (pg_stat_database_blks_hit*100 / (pg_stat_database_blks_read +
pg_stat_database_blks_hit)).avg(['service_instance_id','host_name'])
```
Probably because this metric is at the database level and should not use sum
(which I used to think of as instance level).
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