In the SiriKit Tutorial for iOS, it says at the end, “If your app isn’t covered by the existing domains and intents, try mapping out the intents, parameters, responses and model objects and file a radar.” What does “file a radar” mean?
Short answer: https://bugreport.apple.com
Long answer:
Apple’s Radar system is also open to registered developers who can use it to file bugs or enhancement requests with Apple. Although Radar is reputedly very good when used inside of Apple, this is not generally apparent to users outside of the company. The frequent request to “file a radar” often sounds more or less like “forget it, buddy”, because issues frequently go weeks or even years without so much as an acknowledgement or indeed any indication at all that anyone has even read the issue. This leads to the perception of the Radar system as being something of a black hole.
External users have no way to know if an issue has been reported, so it’s common to file an issue and then be informed that it’s a duplicate of a previous issue. That seems reasonable at first, but in practice it means that you’ll never get notified if the issue is resolved.
source: What is a "radar?" | Apple Developer Forums
It’s basically the place to tell apple about all of your bugs and ehancment requests for their SDKs and platforms 
Hope that helps
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