Many Istio dashboards in Grafana show no data, displaying only N/A.
Grafana 中许多 Istio 仪表盘没有显示任何数据，只显示 N/A。

The "istio_requests_total" metric and other expected Istio metrics series are not being collected by Prometheus.
Prometheus 并未收集“istio_requests_total”指标及其他预期的 Istio 指标系列。

The graphs on the Kiali UI are also lacking information.
Kiali 界面上的图表也缺乏信息。

The permanent fix is to upgrade prometheus-operator to version v0.79.2 or higher. For rancher-monitoring this is achieved by upgrading the chart to version 106.1.0+up69.8.2-rancher.4 or higher, in Rancher v2.11+.
永久修复方法是将 prometheus operator 升级到 v0.79.2 或更高版本。对于牧场主监控，这通过将图表升级到 106.1.0+up69.8.2-rancher.4 或更高版本（牧场者 v2.11+）实现。

In affected versions, the workaround is to edit the envoy service monitor (`kubectl -n istio-system edit servicemonitor envoy-stats-monitor`) and update the operator to '!' instead of DoesNotExist:
在受影响的版本中，解决方法是编辑使者服务监视器（'kubectl -n istio-system edit servicemonitor envoy-stats-monitor'），并将操作员更新为“！”，而不是 DoesNotExist：

<span style="color:#000000"><span style="background-color:#ffffff"><span style="background-color:#efefef"><code>[...]
  selector:
    matchExpressions:
      - key: istio-prometheus-ignore
        operator: '!'</code></span></span></span>

This results from the upstream prometheus-operator issue https://github.com/prometheus-operator/prometheus-operator/issues/7214 . The ServiceMonitor for Istio used matchExpressions with "operator: DoesNotExist". In prometheus-operator versions v0.79.0 and v0.79.1, this operator was not recognized, leading to validation errors (unsupported value: "doesnotexist") and rejection of the ServiceMonitor. As a result, Prometheus did not scrape Envoy metrics. For more information you can refer to https://github.com/rancher/rancher/issues/51982
这是由于上游的普罗米修斯-算子问题 https://github.com/prometheus-operator/prometheus-operator/issues/7214。Istio 的 ServiceMonitor 使用了带有“operator： DoesNotExist” 的 matchExpressions。在 prometheus 操作符版本 v0.79.0 和 v0.79.1 中，该操作符未被识别，导致验证错误（不支持的值：“doesnnotexist”）并拒绝 ServiceMonitor。因此，普罗米修斯没有抓到 Envoy 的指标。更多信息可参考 https://github.com/rancher/rancher/issues/51982