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This snippet looks identical to their example.

<https://github.com/serilog/serilog-sinks-opentelemetry/blob/dev/example/Example/Program.cs>

Assuming the repo example is well up to date.
The endpoint might not be correctly set here.

Can you switch to downward k8s API to get `HOST_IP:4317` instead?

Set the following env for your app manifest:
```env:
  - name: HOST_IP
    valueFrom:
      fieldRef:
        fieldPath: status.hostIP```
And followed by using `http://$(HOST_IP):4317` for your endpoint.