Does the Thanos global querier utilize Announced LabelSets when communicating with other cluster queriers?

[anoop2503]

Hey,

I have set up a global Thanos querier to communicate with 10 individual cluster queriers. Each cluster querier stores has its own set of external labels (cluster_id="1", cluster_id="2", ..., cluster_id="10"). Since the global querier is configured with all these 10 cluster queriers, its store details display all the cluster_id external labels in "Announced LabelSets" column along with the corresponding cluster querier endpoints.

Now, the question is: if I execute a query in the global querier with a specific cluster_id value, will it send this query to all other 10 cluster queriers, or will it send the request only to the cluster endpoint which has the external label id mentioned in the query? Can some one please confirm this?

Thanks