Hello @Ashima Gupta ,
Just to add to what @Khurram Rahim added before . The uptime is a property of compute and so can check the uptime on Azure VM/ local Server , which gives you the time as to for how long the server/ VM . In the case of ADF and cosmosdb , the data / records are stored on some servers , but they are services and so they do not have uptime , they go with SLA which is 99.9 % . https://azure.microsoft.com/en-us/support/legal/sla/data-factory/v1_2/
Please do let me know as to if you have any questions on this .
Thanks
Himanshu