We have multiple small prometheus instances scraping metrics from different
services. In addition, we want a single prometheus as source of truth for
all queries. I was looking to create consolidated read prometheus instance
that can proxy queries to smaller instances by utilizing remote_read config
as below:
```
remoteRead:
- name: shard
url: http://prometheus-shard.monitoring.svc:9090/api/v1/read
```
However, read prometheus queries return empty results. Looking at the
traffic between the prometheus instances, downstream prometheus read api
returns 200 albeit empty results. Read api logs do not show up in query
logs and `read_queries_total` on downstream prometheus is empty.
Are there other configurations needed for remote_read between two
prometheus instances to work?
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