M70c: probes the API server with a limit=1 EndpointSlice LIST through the
existing seam. This is the probe that makes X10-3 visible: an UnknownIssuer
TLS rejection surfaces here as down. 2xx means the API is reachable.
Return Type
Promise<boolean>
Usage
import { KubernetesProvider } from "service-discovery-plugin/src/index.ts";