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State detection:
- Add STATE_STOPPING to ProcessState enum
- Replace system("systemctl is-active") with libsystemd sd-bus API for
accurate starting/stopping/crashed state reporting; works for any unit
type (RCON or STDIN) that declares a service: field
- Implement real A2S_INFO UDP queries (src/console/a2s.c) for units
with health.type = a2s (Valve games: TF2, GMod); differentiates
running / hibernating (0 players) / changing_map (A2S down, RCON up)
/ unreachable; includes player count and map name in responses
- Refactor probe_rcon_state() into probe_unit_state() returning a
ProbeResult struct with state, players, max_players, map fields
- status and list responses now include players/max_players/map fields
New daemon commands:
- tail <unit>: return ring buffer snapshot as a single response
- broadcast <message>: send broadcast_cmd-formatted message to all
running units; works for both RCON and STDIN console types
New YAML field:
- broadcast_cmd: command template (e.g. "say {msg}") — opt-in per
unit; units without it are skipped by broadcast
CLI (umbrella-cli):
- Add tail subcommand (non-interactive output snapshot)
- Add broadcast subcommand
- status shows Players and Map when available
- list adds PLAYERS and MAP columns
Bot (umbrella-bot):
- Replace !attach / !detach with !tail (shows last 30 lines, no streaming)
- Add !broadcast command
- Write per-!cmd audit entries to /var/log/umbrella/bot-audit.log
- !units and !status responses include player counts when available
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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