I’m creating a service that we need to Callback and polling to waiting the service finished. K6 have something specific for that or should be create manually?
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It depends on how you expect to design the polling operation. You could check the timers module.
These similar topics could also be useful Polling in K6 for a specific result and Script to wait for a particular status from a response - #3 by rodyb.
Let me know if it helps.