The best thing about zipkis, it's easy integration with other services like k8s etc., so that we can easily track our application flow across multiple applications/services without writing any code ourselves or using third party tools for this purpose only.
There are some minor issues which I have faced while integrating my project but nothing major as of now. If you're looking out an alternative way then go ahead otherwise use their paid version too because free versions has limited features compared to premium ones where everything works fine even if your traffic increases exponentially at times! We used zipline library from github (https://github.com/) and created custom metrics via Prometheus Operator API(http://prometheusoperator.io). This helped us monitor all aspects related to app performance such as response time, throughput rate, errors rates along with request logs generated by various APIs called through different.