The KES sends a heartbeat every 60 seconds, and when a new play manifest is requested by the player, the platform verifies if it received a heartbeat in the past 180 seconds. If no heartbeat was received, then it will use the configured KES fallback server. If no KES fallback server is configured, it will fall back to the default Kaltura CDN, if it was configured to do so. If it was not configured to use the Kaltura CDN, then the video will fail playback.
