Adds collect_swarm(socket_path) to the host agent. Self-detects a Swarm
manager via /info (Swarm.ControlAvailable) — workers and non-swarm daemons
return None and never touch the manager-only endpoints (one cheap /info call,
no 503s). On a manager it queries /services, /tasks, /nodes and emits
sample["swarm"] = {services, nodes}:
* services roll desired-vs-running replicas up from the task list (replica
health isn't on the service object), handle replicated + global mode, strip
the @sha256 image digest, and carry cross-node task→node placement.
* nodes normalise role / availability / status + the manager leader flag.
build_sample omits the swarm key entirely off managers, same silent contract
as collect_docker. Unit tests cover manager detection, replica roll-up +
placement (replicated & global), node normalisation, worker silent-skip, and
build_sample wiring.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016Jg27rgypiW2efULXJDtMC
bvandeusen
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