logUsage 
  abstract fun logUsage(eventName: String, data: ReadonlyRecord<JsString, TelemetryTrustedValue<*>> = definedExternally)(source)
Log a usage event.
After completing cleaning, telemetry setting checks, and data mix-in calls TelemetrySender.sendEventData to log the event. Automatically supports echoing to extension telemetry output channel.
Parameters
eventName 
The event name to log
data
The data to log