Function find_primary_ips_from_instances 

pub async fn find_primary_ips_from_instances(
    client: &Client,
    instance_refs: &[InstanceReference],
) -> Result<Vec<String>>

Find primary server IPs from a list of instance references.

This is the NEW instance-based approach that replaces cluster-based lookup. It filters the instance refs to only PRIMARY instances, then gets their pod IPs.

Arguments

• client - Kubernetes API client
• instance_refs - List of instance references to search

Returns

A vector of IP addresses for all running PRIMARY pods across all primary instances

Errors

Returns an error if Kubernetes API calls fail or no primary pods are found