Mirrors vs mirrord
mirrord routes a local process into a live cluster; a mirror replaces the backend with a twin built from traces.
Where they differ
mirrord needs a running environment to connect to; a mirror runs from recorded behaviour alone.
A mirror scores how faithful its answers are; a proxy has nothing to score.
When to pick which
mirrord remains the right tool when its own strengths are what you need; a mirror is for testing an agent against a backend that behaves like production without being production.
Related: /glossary/mirror/pricing