Constant IDLE_CLOSE_TIMEOUTS_HELP 

pub const IDLE_CLOSE_TIMEOUTS_HELP: &str = "Idle-close reached the per-session deadline (90 s) and returned to \
     the next tick — indicates a session with an active lease that never \
     drops (stuck stream, hung worker) or a bridge publish stalled behind \
     an unresponsive broker. A steady rate > 0 requires operator \
     investigation of the coincident session id.";

Shared HELP for av_idle_close_timeouts_total (boot pre-registration and reconciler idle-sweep lookup). Same first-wins/no-drift rationale as SESSION_CLOSE_TIMEOUTS_HELP.