Unknown transport zone status shown in Monitoring Dashboard instead of meaningful state

Products

• VMware NSX

Issue/Introduction

• In the UI, the Monitoring Dashboard shows one or more Transport Zones as Unknown under [Home] > [Monitoring - Dashboard] > [System] > [FABRIC]. 
  
• When an operator clicks the Unknown count and navigates to [System] > [Fabric] > [Transport Zones] and applies the Unknown filter, the listed Transport Zones all show Status: Up. 
  This inconsistent displayed status is causing confusion.
  
  
  

Environment

VMware NSX 4.2.X

Cause

The aggregate-status API returned a summary status of UNKNOWN for transport zones that were not associated with any transport nodes. 
The dashboard and related heatmap API responses did not distinguish “unused” transport zones from zones with real health issues, so the dashboard rollup showed UNKNOWN counts for those objects.

Resolution

In NSX 9.0 and later releases, the transport zone aggregation API has been updated, adding a new summary status, "UNUSED," for transport zones that do not have an associated transport node.
The high-level transport-zone status/heatmap API was enhanced to include an unused_count field so the dashboard can report UNUSED items separately from UP/DOWN/DEGRADED/UNKNOWN.