Notifications about streams becoming active or inactive on a topic.
Opened with `SubscribeToActiveStreams(topicName)`; the server pushes
`ActiveStreamsChanged` events with an action of `AddUpdate` or `Remove`.
Closed with `UnsubscribeFromActiveStreams(topicName)`.
Client-to-server SignalR invocation to subscribe to active-stream changes.
Content-Type: application/json
ActiveStreamsChanged
A stream was added/updated or removed on the topic.
Content-Type: application/json
About AsyncAPI
The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.
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