Can we measure service load on the Gateway instance, if yes how?

Hi All,

   We would like to understand how many calls are hitting the GW instance, so that we can look at instances being increase for our production server.We have already planned the number of hits based on no: of entities * no:of users* frequency of calls per entity. But would like to see whether the same is getting hit or how many users are using the services on daily basis.

  So wanted to know if we have programs or T-Codes or scripts present to check the same.

Thanks in advance.

Regards,

Kiran A