Hello!
I've a query that looks like so:

 
max by (  cluster_id, email_domain,  risk ) ( 
                subscription_labels{email_domain!~"google.com"} + on 
(cluster_id) group_left(_ignore)  
                (0 * topk by (cluster_id) (1, 
cluster_version{version=~"4.[2-9].*",type="current"}) ) 
            )

problem is: 
if a cluster is not present in cluster_version{} it will not be returned by 
the query.
In other words let's assume that there's a cluster with id "123" that is 
not present in cluster version (that is the query 
cluster_version{cluster_id="123"} returns 0 results) and a cluster with 
id="555" that has version="0.1.1" . I want the query to discard the cluster 
555 and return 123 (the version is unknown in this case).

How can I achieve this?

I tried the following query:

max by (  cluster_id, email_domain,  risk ) ( 
                subscription_labels{email_domain!~"google.com"} + on 
(cluster_id) group_left(_ignore)  
                (0 * topk by (cluster_id) (1, 
cluster_version{version=~"4.[2-9].*",type="current"}) ) 
            ) *or on (cluster_id) subscription_labels*

but it returns much more records (like 40220 vs 16922) than the query:

max by (  cluster_id, email_domain,  risk ) ( 
                subscription_labels{email_domain!~"google.com"} 
            )

So I guess something is wrong.

Thanks for the help,
Daniele

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