Load Balancer Pool Health Monitor removed after editing Pool configuration in VMware Cloud Director Tenant UI

Products

• VMware Cloud Director

Issue/Introduction

• When editing a Load Balancer pool from the vCloud Director Tenant UI, the previously assigned Health Monitor is automatically removed from the pool in AVI Load Balancer
•  After saving the pool, the Health Monitor still appears assigned in vCloud Director UI, but in the AVI UI the Health Monitor Field is empty.
• This affects all pools configured via the Tenant Portal across multiple organizations and environments.

Environment

VMware Cloud Director: 10.6.1

Cause

This issue can occur due to a version handling issue in API version 39.0. Starting with API 39.0, VMcloud Director uses a dedicated endpoint for Health Monitor assignment.
Health Monitor references are no longer supported in the Load Balancer pool update payload

The system continues to push the entire pool configuration to AVI Load Balancer without validating the API version during updates.

As a result, AVI receives an empty Health Monitor Field during the pool update, which causes existing Health Monitor assignments to be deleted on the Avi side.

Resolution

This is a known issue and VMware will address this issue in a future version release.

Avoid editing existing Load Balancer pools after assigning a Health Monitor.

If changes must be made:

1. Edit the pool in the Tenant Portal and apply the desired changes.
2. Re-open the pool configuration and re-attach the Health Monitor after saving.