AKS Known Issues

Match exact AKS operation-failure signatures to documented causes and fixes. WHEN: an AKS create, scale, upgrade, node-image, or image-pull failure names VMCannotFitEphemeralOSDisk, LinkedAuthorizationFailed, NodePoolMcVersionIncompatible, 'NodeImageVersion is not accepted', SkuNotAvailable, ZonalAllocationFailed, OverconstrainedAllocationRequest, or an AKS vmssCSE/CSE nested signature: VMExtensionError_OutboundConnFail (exit 50), VMExtensionError_K8SAPIServerConnFail (exit 51), or VMExtensionError_K8SAPIServerDNSLookupFail (exit 52); also questions asking what a named AKS error means, and AllocationFailed only when its nested Azure message states internal error or insuff…