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It's really cool, but from my understanding you get only the traffic exchanged with your browser and not between the servers. I wonder if something similar could be done at the server level, aggregating traffic from all the servers, merge together and display

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The bottom half of the example diagram shows traffic between the "backend" and "keycloak" that clearly isn't browser to nginx traffic.

You'd need to be running wireshark on a network interface that could see all that traffic, so yeah - sort of "at the server level" - in the sense that you'd need to be sitting on the server's network(s) to sniff that.

Weave Scope can do that: https://www.weave.works/oss/scope

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