Worker Nodes Not Recognized as Active in Citus Cluster with Patroni

## Problem Description
I'm setting up a PostgreSQL cluster using Citus and Patroni. While I've successfully added worker nodes to the cluster, the system doesn't seem to recognize them as active workers.

## Current Behavior
When I query the cluster nodes using `SELECT * FROM pg_catalog.pg_dist_node;`, I can see all worker nodes and coordinators listed correctly. However, when I run either:
- `SELECT * FROM citus_check_cluster_node_health();`
- `SELECT * FROM citus_get_active_worker_nodes();`

Both of these queries return empty results, indicating that the workers aren't being recognized as active.

## Expected Behavior
Both queries should return information about the worker nodes that are visible in `pg_dist_node`.

## Environment Information
- Citus version: 13.0-1
- PostgreSQL version: 17.4
- Patroni version: 4.0.4
- OS: Ubuntu 24.04-2
- Deployment method: Proxmox LXC

## Steps to Reproduce
1. Set up a Citus cluster with Patroni
2. Add worker nodes to the cluster
3. Run `SELECT * FROM pg_catalog.pg_dist_node;` to confirm nodes are added
4. Run `SELECT * FROM citus_check_cluster_node_health();` and `SELECT * FROM citus_get_active_worker_nodes();`
5. Observe that both queries return empty results

## Additional Information
We chose not to use Patroni's Citus support because we need to manage multiple databases with Citus. Instead, we created separate clusters: coordinator cluster, worker1 cluster, worker2 cluster, etc. We placed HAProxy+keepalived in front of the system for high availability. We added the coordinator and workers to Citus using their virtual IPs.

## Question
What could be causing this discrepancy, and how can I ensure that my worker nodes are properly recognized as active in the cluster?