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Report enableagent VM extension fallback usage #5477

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Report enableagent VM extension fallback usage #5477

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24 changes: 16 additions & 8 deletions src/Agent.Listener/Agent.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -277,13 +277,22 @@ public async Task<int> ExecuteCommand(CommandSettings command)
var systemVersion = PlatformUtil.GetSystemVersion();

Dictionary<string, string> telemetryData = new Dictionary<string, string>
{
{ "OS", PlatformUtil.GetSystemId() ?? "" },
{ "OSVersion", systemVersion?.Name?.ToString() ?? "" },
{ "OSBuild", systemVersion?.Version?.ToString() ?? "" },
{ "configuredAsService", $"{configuredAsService}"},
{ "startupType", startupTypeAsString }
};
{
{ "OS", PlatformUtil.GetSystemId() ?? "" },
{ "OSVersion", systemVersion?.Name?.ToString() ?? "" },
{ "OSBuild", systemVersion?.Version?.ToString() ?? "" },
{ "configuredAsService", $"{configuredAsService}"},
{ "startupType", startupTypeAsString }
};

// Check for EnableAgent fallback indicator
string fallbackUsed = Environment.GetEnvironmentVariable("VSTS_AGENT_VMEXT_FALLBACK_USED");
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@merlynomsft merlynomsft Feb 6, 2026

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(not related to line) pending local testing, will resolve when complete

if (!string.IsNullOrEmpty(fallbackUsed) && fallbackUsed.Equals("true", StringComparison.OrdinalIgnoreCase))
{
telemetryData["EnableAgentVmExtFallbackUsed"] = "true";
Trace.Info("EnableAgent VM extension fallback detected");
}

var cmd = new Command("telemetry", "publish");
cmd.Data = JsonConvert.SerializeObject(telemetryData);
cmd.Properties.Add("area", "PipelinesTasks");
Expand All @@ -296,7 +305,6 @@ public async Task<int> ExecuteCommand(CommandSettings command)
Trace.Warning($"Unable to publish telemetry data. {ex}");
}


// Run the agent interactively or as service
return await RunAsync(settings, command.GetRunOnce());
}
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