RealtimeObserver 
    interface RealtimeObserver
RealtimeObserver lets one listen to real time events such a volume, signal strength, or attendee changes.
Note: all callbacks will be called on main thread.
Inheritors
Functions
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                  Handles attendee(s) being dropped due to network.
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                  Handles attendee(s) being added.
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                  Handles attendee(s) being removed.
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                  Handles attendee(s) whose VolumeLevel has changed to muted.
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                  Handles attendee(s) whose VolumeLevel has changed from muted.
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                  Handles signal strength changes for attendees whose SignalStrength has changed.
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                  Handles volume changes for attendees whose VolumeLevel has changed.