A company has deployed an application that uses the Azure Web App service and the SQL database service. Currently, the Azure Web App service has an SLA of 99.95%, and that of the SQL database is 99.99%. Which of the following are used as availability metrics you would get from customers to understand SLA acceptability for an application? Choose 2 answers from the options given below.

Answer options:

A.Mean time to recover (MTTR)
B.Mean time between failures (MTBF)
C.Mean time to success (MTTS)
D.Mean time to failure (MTTF)

Answer – A and B 
The 2 metrics are Mean time to recover (MTTR) and Mean time between failures (MTBF). 
The Microsoft documentation mentions the following. 

Since this clearly mentioned in the documentation all other options are incorrect. 
For more information on Architecture reliability requirements, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/architecture/reliability/requirements