Metric Registrar can't fetch custom app metrics during BBR

Products

• VMware Tanzu Application Service for VMs

Issue/Introduction

Metric Registrar for VMware Tanzu Application Service (TAS) for VMs provides the option that developers can define and use their own custom app metrics, it's composed with three components:

• orchestrator
• endpoint_worker
• log_worker

endpoint_worker is the daemon that fetches custom app metrics from registered app endpoints and forwards to loggregator. In order to associate app's info and metrics data, it reaches out to Cloud Controller (CC) to get app metadata, before scraping app metrics.

When all Cloud Controllers are not available, for example, during BBR all cloud controllers are brought down, the endpoint_worker can't scrape any custom app metrics.

This limitation exists in TAS for VMs v2.4 - v2.9.

Environment

Product Version: 2.9

Resolution

log_worker is not affected because it has no dependencies on cloud controllers.