How can I get istio-proxy stat when triggering circuit breaker?

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I am using the istio 1.13.2 to test the function of circuit breaker with fortio step by step according to the document.But I get nothing when I run kubectl exec “$FORTIO_POD” -c istio-proxy – pilot-agent request GET stats | grep httpbin | grep pending.I feel confused about it. Is there any other settings about fortio or istio? And I find the value of upstream_rq_pending_overflow is 0.

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$ istioctl version
client version: 1.13.2
control plane version: 1.13.2
data plane version: 1.13.2 (13 proxies)
$ kubectl version --short
Client Version: v1.23.1
Server Version: v1.23.1

githublink: How can I get istio-proxy stat when triggering circuit breaker? · Issue #38193 · istio/istio · GitHub