argo是一个Open source Kubernetes native workflows, events, CI and CD
这里主要是介绍它的events机制，也就是所谓的事件驱动？
gatewayswhich are implemented as a Kubernetes-native Custom Resource Definition that either produce the events internally or process the events that originate from outside the gatewayssensorswhich are implemented as a Kubernetes-native Custom Resource Definition that define a set of dependencies and trigger actions.- Define multiple dependencies from a variety of gateway sources
- Build custom gateways to support business-level constraint logic
- Trigger messages and Kubernetes object creation after successful dependency resolution
- Trigger escalation after errors, or dependency constraint failures
- Build and manage a distributed, cross-team, event-driven architecture
- Easily leverage Kubernetes-native APIs to monitor dependencies
gateways作为producer，sensors的作用？