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I have small cluster and the only reason I’d want service mesh is to inspect req/resp between services for better debug. And I’m not even sure they can do that.

Retries for free are good I guess, but not something essential. MTLS is something I don’t want at all.

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Couldn't you accomplish that with tracing? You may not even need any changes in your application as eBPF maybe able to automatically instrument the application. Alternatively, If you use Cilium as a CNI, this functionality can come out the box. https://docs.cilium.io/en/latest/observability/visibility/

Exactly if you don't need the functionality provided don't use a mesh, but consequently if you then use it. Honestly not very complicated, but mTLS is very complicated done correctly.

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