openbao has never started on a hive that deploys it. With raft storage
and no `cluster_addr`, `bao server` exits 1 before serving anything:
cluster address must be set when using raft storage
Reproduced against openbao 2.6.2 with the module's own config shape:
the same JSON minus `cluster_addr` exits 1 with that line, and with it
the server comes up and configures every listener.
Both addresses are built from `swarm.bao.domain` rather than a bind
address — that is the URL a reader already dials (`BAO_ADDR` in
glue-matrix-bao-token) and the name the server certificate carries.
Cluster traffic sits one port up, upstream's convention.
The `unknown or unsupported field loopback` warning in the same startup
log is unrelated and cosmetic: openbao's unknown-field check does not
know about named listener blocks, but the parser honours `type` and
configures each one (measured, two named listeners, both served).
Noted in the module so the next reader does not chase it; the JSON
array form that avoids the warning does not typecheck against nixpkgs'
`settings.listener` (`attrsOf`).
module-eval gains the regression gate plus a control that the settings
it reads vary per deployment.
Refs #3860
75a6101f66