Track agent.heartbeat and report.daily.ssh per host; show online/stale
on Hosts UI; dashboard counters and SAC_HEARTBEAT_STALE_MINUTES config.
Co-authored-by: Cursor <cursoragent@cursor.com>
Send Telegram alerts for high/critical events and new Problems.
Configurable via TELEGRAM_* env vars; ingest never fails on send errors.
Co-authored-by: Cursor <cursoragent@cursor.com>