After Phase 2f-3 mana-ai lives on the GPU-Box, so the
blackbox-internal docker-DNS probe (http://mana-ai:3066/health) is
gone — that target sits in a Docker network the blackbox-exporter
can't reach across LAN. Move the probe into blackbox-api against
the public hostname; gives the same up/down signal plus exercises
the Cloudflare-tunnel hop.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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