Hey - small ask. The existing health RPC (behind openclaw gateway health) returns service-level summary - agents, channels, sessions. For a UI that needs a live "is the gateway reachable / how fast right now" indicator, what would help is a few connection-level fields on the same response: connected, rttMs (rolling mean of recent ping/pongs), and lastHeartbeatAt.

Could be added onto the existing health summary, or a separate lightweight gateway.ping if you'd rather keep the deep health probe heavier than a UI polling cadence. No strong preference.

No urgency - just wanted to surface it. Glad to test against a branch if you push something.