In some environments it may be tricky to run a command
before RabbitMQ is started. Kubernetes For example, upgrading
to Containerd 2.0 accidentally lowered the value of available
descriptors in GKE
(https://cloud.google.com/kubernetes-engine/docs/troubleshooting/known-issues#containerd-ulimit-reduced).
While this particular issue is resolved in newer GKE versions,
it was a good example of why a variable like this would be helpful.
Kubernetes-level solutions (on the node or with a daemonset) would
require a different level of access for users.
ad3fccf5eb