How to generate traffic to microservices

Let's say I have 4 backend microservices which are deployed somewhere in Kubernetes cluster on some cloud provider (e.g. Azure). I want to test how much traffic they can handle and generate real requests to them. Requests should behave just like a real requests which would come from Client API or FrontEnd application. Is there any existing tool which allow me to generate such traffic (on various endpoints, not just 1 particular). I want these tests to be performed in long time (~ 3/4 days). I know that there is JMetter but it doesn't fully fit my needs. Also bash scripts are not good idea. Do you know any other tools than than? It maybe sth from Azure background.