PromQL query with selectors are returning no data

[sunng87]

What type of bug is this?

Incorrect result

What subsystems are affected?

Frontend

What happened?

On distributed + object storage deployment, we experienced bug that PromQL query with a label filter only returns some or even no data.

host_cpu_seconds_total{mode="user"} returns no data

but if we query host_cpu_seconds_total it dumps those rows where mode is user

What operating system did you use?

any

Relevant log output and stack trace

No response

How can we reproduce the bug?

1. Ingest some data from vector
2. query host_cpu_seconds_total{mode="user"} to see if it happens