After the boot-time mine.update, have the manager actually render the
node_data pillar and log whether it came back populated. node_data: False
makes salt/top.sls apply the bootstrap recovery branch instead of the
manager's real config, so surfacing this in the journal makes the
condition visible before so-boot-highstate runs. Best-effort and
non-blocking: always exits 0 so highstate proceeds regardless.
so-boot-mine-update.service is a manager-only Type=oneshot unit that runs
once per boot after salt-master/salt-minion start and before
so-boot-highstate.service. It pushes mine.update to all reachable minions
so mine-backed pillars (node IPs, ES/Redis/Logstash discovery) are fresh
before the boot highstate renders them.
The helper waits for the responsive minion set to settle (plateau) rather
than for every accepted key to report up, so an intentionally powered-off
minion doesn't block the update; MAX_WAIT remains as a backstop.
Josh Patterson