Paths exempted from the limiter, matched against IRequest.path. A string
is an EXACT match; a RegExp is tested against the path.
Omitted, this is DEFAULT_RATE_LIMIT_EXCLUDED_PATHS — the six
operational paths the framework's own plugins serve. That default exists
because the limiter is documented as a global middleware and the CLI
scaffolds Kubernetes probes pointing at /live and /ready: without it,
an exhausted bucket answers the liveness probe 429 and the kubelet
restarts a container whose only fault is that it is under load.
Pass [] to exempt nothing, which is the pre-0.5.0 behaviour.