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Probes: liveness, readiness and startup

Article 18 left the Ready condition unexplained. Behind it sits the probe — how the kubelet asks a container three different questions: are you alive, are you ready for traffic, have you finished starting. This article separates the three kinds of probe per the docs, then verifies each with real pods: liveness kills and restarts, readiness removes the pod from a Service's endpoints, startup disables the other two until the app has time to start.