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Every decision to settle before you create the cluster: node count and quorum, Corosync network separation, storage model, and the HA fencing implications of each choice.

A commented IOS-XE baseline for a dual-homed enterprise edge: prefix filters, martian rejection, maximum-prefix guards, RPKI validation, and traffic engineering hooks.

A read-only SQL script reporting on unused indexes, duplicate indexes, table and index bloat, cache hit ratios, long-running queries, and autovacuum backlog.

Ready-to-use systemd override files for common service profiles — web application, background worker, network daemon, and fully isolated batch job.

A twelve-month programme plan with phases, dependencies, decision points, and the metrics to report to a steering group.

Templates for the documentation that actually gets used during an incident: IP allocation, VLAN register, physical connectivity, and an escalation runbook.