pod 的 tcp 连接数

参考：
Pod:
kubernetes - monitor the number of k8s pod’s tcp connections - Stack Overflow

容器内部网络状态监控，文件系统监控 - wenyanet
|__* Cadvisor metric “container_network_tcp_usage_total” always “0” · Issue #60279 · kubernetes/kubernetes

Istio / Collecting Metrics for TCP Services

Node:
How I get the number of (currently) established TCP connections in prometheus (kubernetes monitoring) - Stack Overflow

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