Which of the following options are the challenges faced by traditional application operation and maintenance in cloud scenarios? (Multiple choices)

Which of the following options are the challenges faced by traditional application operation and maintenance in cloud scenarios? (Multiple choices)
A . Unable to grasp the user’s real experience, poor application experience leads to user churn
B . Difficult analysis of distributed application problems in cloud scenarios
C . There are many traditional operation and maintenance tools, and the cost of use and maintenance is high
D . Unable to get application logs

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Answer: ABCD