Diego memory and disk metrics missing in Tanzu Hub due to OpenTelemetry (OTel) regression

Products

• VMware Tanzu Platform Core
• VMware Tanzu Platform - Hub

Issue/Introduction

Symptoms

Users may observe that Diego memory and disk reporting metrics are missing or blank within the Tanzu Hub dashboard for specific foundations.

• Metrics are correctly displayed on some foundations.
• Metrics are missing on foundations running FoundationCore 3.3.0.
• The hub-tas-collector logs may show successful connectivity but a lack of incoming metric payloads for Diego cells.

Cause

This issue is caused by a regression in the OpenTelemetry (OTel) component integrated within FoundationCore 3.3.0. The regression prevents the collector from correctly processing and forwarding Diego-specific resource metrics (memory and disk) to the Tanzu Hub telemetry pipeline.

Resolution

There is no configuration-based workaround for the OTel regression in version 3.3.0. An upgrade to a patched version of FoundationCore is required to resolve the defect.

For diagnostic purposes, you can confirm the metrics gap by inspecting the collector logs: bosh -d hub-tas-collector-<deployment_id> logs

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