Windows service

How to use web service on Graphana.
I need to call a web serivce and then assign string return value into gloabal string variable.

I don’t really understand your question, but maybe you can use the AJAX plugin, which can be used to call web services ?

we have a web service which is returning operating system user name as a string value on client pc. Then we are using that value in store procedure as input parameters.
Do you suggest any other method that we get operating system user name ?