Noticed Cortex Query Timeout and Data Inconsistency Issues #7733

Cortex returns inconsistent results for the same query.

Repeatedly executing the same query (or refreshing the dashboard) returns different data without any changes to the query parameters.

Ideally, the query should either:

Return the same data if no new data has been ingested, or

Return updated data only when new data is available.

Instead, the results intermittently alternate between older and newer data, indicating possible inconsistency in query execution or data availability.

Seeing gaps when we query for 1 hour and when same query for 3 hours shows data in the grafana

Cortex version used is 1.21.0 with regex matcher enabled.