Microsoft.Azure.WebJobs.Script.FileTraceWriter.GetInstanceId C# (CSharp) Method

        internal static string GetInstanceId()
        {
            string instanceId = ScriptSettingsManager.Instance.GetSetting(EnvironmentSettingNames.AzureWebsiteInstanceId);
            if (string.IsNullOrEmpty(instanceId))
            {
                instanceId = Environment.MachineName;
            }

            instanceId = instanceId.Length > 10 ? instanceId.Substring(0, 10) : instanceId;

            return instanceId.ToLowerInvariant();
        }
    }