Query health
When a live widget stops updating, the first question is whether its subscription still exists. The query health endpoint answers that for the caller asking, and nobody else.
Turn it on
Section titled “Turn it on”const builder = ArcApplication.createBuilder({ query: { enableObservableHealth: true }, authentication: [/* verified handlers */] });query.enableObservableHealth: true registers /.cratis/queries/health as an observable query for GET and QUERY. It requires authentication.
What it reports
Section titled “What it reports”An authenticated caller sees only its own tenant and principal’s hub connections, their subscription counts, and query groups. Direct SSE and WebSocket connections and remote IP addresses are not included. Other callers’ unchanged snapshots are not emitted to you, and your own bursts are coalesced. The built-in health query is not emitted as an application proxy in the client manifest.