Please Implement instances graph in rps mode [feature request]

[do11]

Please implement active instances graph in rps_schedule mode. That would be useful.

Also, this will make new user (or external person to who user sends graphs to interpret) more easily understand that RPS graph is not instance graph.

If this is already possible to graph (in default report, I don't know if there's any other type report, though) please provide example how to enable it.

Best regards,

ps. Assumed config:

[phantom]
rps_schedule=line(1,20,5m)
ammofile=ammo.txt
[tank]
plugin_web=yatank_OnlineReport