生了巨大的影响力，在互联网行业广泛使用，但是这⼀阶段的开源除了情怀和展示技术影响力之后 很难量化对公司的价值，因此也比较难以持续发展。第二个阶段是 2018 年开始，随着云计算发展， 开源作为⼀种标准加速云计算发展，尤其 K8s 迅速崛起给我们很多启示，作为⼀家云计算公司，阿 里巴巴也在 2018 年制定了⼀个全面开源，加速企业数字化转型，影响 100w 开发者的战略目标， 这个阶段的开源发生了本质的两个变化，第⼀更重 Istio。 Nacos 生态 < 156 我们都知道 K8s 改变了传统的应用部署发布的方式，给容器化的应用服务提供了灵活方便的容器编 排、容器调度和简单的服务发现机制，但缺少了更丰富和更细粒度的服务治理能力。而 Istio 的出 现正是为了弥补 K8s 在服务治理上的不足，它定义⼀套标准 API 来定义常见的治理策略。 从我的角度和理解来看，K8s 与 Istio 呈互补关系，共同决定了业务应用的部署、发布以及运行时 架构中，流量是通过 ingress 网关接入的，进入微服务 体系，与 1.0 架构不同的是引入了数据面 Envoy 和控制面 Istio，Envoy 以 Sidecar 模式与应用部 署在同⼀个 Pod 中，会劫持应用的进出流量，然后可以通过控制面 Istio 下发的 XDS 配置实现流 量控制、安全、可观测能力，这⼀架构的优势是将服务治理能力与业务逻辑解耦，把服务框架中 SDK 大部分能力剥离出来，下沉到

Dynatrace operator is running, enrich metrics with additional metadata (e.g. about the host, process or pod). • Default dimensions: specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured via the PodSpec in the pod’s configuration file as follows: spec:

is running, enrich 351 metrics with additional metadata (for example, about the host, process, or pod). • Default dimensions: Specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured by using the PodSpec in the pod’s configuration file as follows:

is running, enrich 346 metrics with additional metadata (for example, about the host, process, or pod). • Default dimensions: Specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured by using the PodSpec in the pod’s configuration file as follows:

is running, enrich 350 metrics with additional metadata (for example, about the host, process, or pod). • Default dimensions: Specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured by using the PodSpec in the pod’s configuration file as follows:

operator is running, enrich metrics with additional metadata (for example, about the host, process, or pod). • Default dimensions: Specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured by using the PodSpec in the pod’s configuration file as follows:

operator is running, enrich metrics with additional metadata (for example, about the host, process, or pod). • Default dimensions: Specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured by using the PodSpec in the pod’s configuration file as follows:

operator is running, enrich metrics with additional metadata (for example, about the host, process, or pod). • Default dimensions: Specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured by using the PodSpec in the pod’s configuration file as follows:

operator is running, enrich metrics with additional metadata (for example, about the host, process, or pod). • Default dimensions: Specify key-value pairs that are added to all exported metrics. If tags with traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured by using the PodSpec in the pod’s configuration file as follows:

traffic can be routed to a pod that has also begun its shutdown processing. You can configure a sleep execution in a preStop handler to avoid requests being routed to a pod that has already begun shutting requests to stop being routed to the pod and its duration will vary from deployment to deployment. The preStop handler can be configured via the PodSpec in the pod’s configuration file as follows: spec: any remaining in-flight requests to complete. NOTE When Kubernetes sends a SIGTERM signal to the pod, it waits for a specified time called the termination grace period (the default for which is 30 seconds)