finding source of deprecation errors

I just upgraded to Ember 1.13.3 and Ember Data 1.13.5 and I am now seeing some deprecation warning messages. Specifically I see the following message:

Ember.keys is deprecated in favor of Object.keys

And along with that message I see the following trace:

 at Object._emberMetalCore.default.deprecateFunc [as keys] (http://localhost:3000/assets/frontend/vendor.self.js?body=1:16037:34)
        at Ember.DefaultResolver.extend.knownForType (http://localhost:3000/assets/frontend/vendor.self.js?body=1:68044:30)
        at Function.knownForType (http://localhost:3000/assets/frontend/vendor.self.js?body=1:15302:25)
        at Object.Registry.knownForType (http://localhost:3000/assets/frontend/vendor.self.js?body=1:12666:39)
        at Object.Registry.knownForType (http://localhost:3000/assets/frontend/vendor.self.js?body=1:12662:39)
        at Object.discoverKnownHelpers [as default] (http://localhost:3000/assets/frontend/vendor.self.js?body=1:20504:28)
        at new RenderEnv (http://localhost:3000/assets/frontend/vendor.self.js?body=1:20775:100)
        at Function.RenderEnv.build (http://localhost:3000/assets/frontend/vendor.self.js?body=1:20783:12)
        at Object.renderHTMLBarsBlock (http://localhost:3000/assets/frontend/vendor.self.js?body=1:20831:56)

I'm having difficulty understanding how I can track down the source of the deprecation warnings from the trace above.