Rakesh_a You need the following to be quick if asked.
1. A great naming policy for configuration that you create. 2. Ensure that a DNS record exists for all FQDNs that you must locate. 3. Have a record of what IPs belong to which F5 in your infrastructure. 4. A record of all NATs and the device they are associated to because most likely a large portion of these will have public IPs and your F5s will live in private IP space in most situations but not all.
Other than the above which is more of a process on sorting your information for the future and will require a significant amount of work hours you can follow what Mohamed_Ahmed_Kansoh recommended.
To view virtual server statistics, on the Main tab, click Statistics > Analytics> > Virtual Servers. The Virtual Servers Traffic Details chart opens showing the total client connections per virtual server over a period of time. Click the other items on the menu bar to see packet use or information in bits.