static CONNECTION_NOTIFIERS: OnceLock<Arc<RwLock<HashMap<String, Arc<Notify>>>>>Expand description
Per-sidecar connection-ready notifiers. Keyed by the sidecar identifier
(e.g. "cocoon-main"). Callers that need the connection before issuing an
RPC can await the Notify instead of polling IsClientConnected.
The Notify is created lazily on first GetConnectionNotify call and
fired (notify_waiters) once in ConnectToSideCar after a successful
handshake. Subsequent calls see a pre-fired notifier and wake immediately.