Foreman » Smart Proxy

GET /register returns the same shell script for all hosts sharing the same registration parameters (org, location, hostgroup, activation keys). Under bulk registration — 100+ hosts hitting the same capsule simultaneously — this endpoint is called once per host, each time proxying to Foreman and waiting for the ERB template to render (~103ms in profiling).

This change caches the rendered script in memory (5-minute TTL) keyed on a canonical form of the request query string, with per-key double-checked locking to prevent thundering herd while allowing concurrent requests for different keys to fetch from Foreman in parallel.