Report enableagent VM extension fallback usage #5477
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Detect VSTS_AGENT_VMEXT_FALLBACK_USED environment variable set by VMSS extension and include in startup telemetry for monitoring storage outage impact. #ab2354671
merlynomsft
commented
Feb 6, 2026
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| // Check for EnableAgent fallback indicator | ||
| string fallbackUsed = Environment.GetEnvironmentVariable("VSTS_AGENT_VMEXT_FALLBACK_USED"); |
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(not related to line) pending local testing, will resolve when complete
tarunramsinghani
approved these changes
Feb 9, 2026
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Detects when VMSS extension uses fallback enableagent script and reports via startup metrics.
Changes
Context
Complements VMSS extension fallback mechanism (microsoft/vsts-azurevm-extension#262) by enabling visibility into when bundled scripts are used during vstsagenttools storage account outages.
AB#2354671