Complete procedures with a way back.

Pin LiteLLM v1.93.0, publish stable provider aliases behind TLS and scoped virtual keys, enforce budgets and shared limits, constrain fallbacks by privacy policy, prove redaction, and rehearse recovery and rollback.

Build a tagged Ubuntu Tailscale router, advertise and approve a private subnet, authorize users with least-privilege grants, test optional internet egress, and rehearse failure, withdrawal, and replacement.

“Temporary failure in name resolution” is a resolver failure, not proof that a hostname does not exist. Compare the application's lookup context with NSS, systemd-resolved and the configured upstream before continuing through routing, MTU, loss and transport diagnosis.