Goto Dashboards → Analytics → Service Latency.

Set Time Filter to 5 minutes (this is usually generates a 1 sec interval).

Set Service Filter to required service name (Optional).

You will see your time series for each of the TOP5 services in the Legend on the Service Elapsed Time (Top 5) - marked in red rectangle.

While point with the mouse on a specific sampling point you can see the rate for this point of time - marked in green rectangle.

You can see below more detailed information on latencies ( request, response , backend , inside datapower ...)