What is pancake.apple.com?

I noticed that my app running in the simulator printed this line in the console:

RTCReporting: resolve from http://pancake.apple.com/bags/hls?version=4.12

Now, there is already a question which attempts to answer why this exception is occuring, but frankly I would rather now what pancake.apple.com is and why it is returning a plist? What is this plist used for, and moreover, what is pancake.apple.com, are there other instances where this endpoint gets called?

And here are the contents in all their base 64 decoded glory:

This is the "bag"

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist version="1.0"><dict><key>apple_internal</key><dict><key>dashboard</key><dict><key>display_url</key><string>https://hls.apple.com/dashboard/</string><key>ip</key><string>17.197.13.203</string><key>port</key><integer>16384</integer></dict><key>power</key><dict><key>foo</key><string>bar</string></dict><key>splunk</key><dict><key>clients</key><array><dict><key>client</key><string>AppleTV</string><key>device_whitelist</key><array><string>Apple TV</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>netflix,vega,hulu</string></dict><dict><key>client</key><string>Netflix</string><key>device_whitelist</key><array><string>iPhone</string><string>iPad</string><string>iPod touch</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_qos</string><key>sampling_threshold</key><real>1.0</real></dict><dict><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>hierarchy</key><integer>1</integer><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_itr_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>tilt</string></dict><dict><key>client</key><string>AppleTV</string><key>device_whitelist</key><array><string>Apple TV</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>itunes.extras</string></dict><dict><key>client</key><string>YouTube</string><key>device_whitelist</key><array><string>iPhone</string><string>iPad</string><string>iPod touch</string></array><key>event_threshold</key><integer>50</integer><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_qos</string><key>sampling_threshold</key><real>1.0</real></dict></array></dict></dict><key>development</key><dict><key>dashboard</key><dict><key>display_url</key><string>https://hls.apple.com/dashboard-dev/</string><key>ip</key><string>17.197.13.218</string><key>port</key><integer>16384</integer><key>reliable</key><integer>500</integer></dict><key>power</key><dict><key>foo</key><string>bar</string></dict><key>splunk</key><dict><key>clients</key><array><dict><key>client</key><string>AppleTV</string><key>device_whitelist</key><array><string>Apple TV</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>0.9</real><key>service</key><string>netflix,vega,hulu</string></dict><dict><key>client</key><string>Netflix</string><key>device_whitelist</key><array><string>iPhone</string><string>iPad</string><string>iPod touch</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_qos</string><key>sampling_threshold</key><real>1.0</real></dict><dict><key>filters</key><array><dict><key>action</key><string>sha256</string><key>key</key><string>URI</string><key>method</key><integer>1</integer><key>status</key><integer>0</integer></dict><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>hierarchy</key><integer>1</integer><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>0</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_itr_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>tilt</string></dict><dict><key>client</key><string>AppleTV</string><key>device_whitelist</key><array><string>Apple TV</string></array><key>filters</key><array><dict><key>action</key><string>sha256</string><key>key</key><string>URI</string><key>method</key><integer>1</integer><key>status</key><integer>0</integer></dict><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>0.9</real></dict><dict><key>client</key><string>netflix</string><key>device_whitelist</key><array><string>iPhone</string><string>iPad</string><string>iPod touch</string></array><key>filters</key><array/><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>0.9</real></dict><dict><key>client</key><string>AppleTV</string><key>device_whitelist</key><array><string>Apple TV</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>itunes.extras</string></dict><dict><key>client</key><string>iTunes</string><key>device_whitelist</key><array><string>Mac</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_qos</string><key>sampling_threshold</key><real>1.0</real></dict></array></dict></dict><key>release</key><dict><key>splunk</key><dict><key>clients</key><array><dict><key>client</key><string>AppleTV</string><key>device_whitelist</key><array><string>Apple TV</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>0</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>netflix,vega,hulu</string></dict><dict><key>client</key><string>Netflix</string><key>device_whitelist</key><array><string>iPhone</string><string>iPad</string><string>iPod touch</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>0</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_qos</string><key>sampling_threshold</key><real>1.0</real></dict><dict><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>hierarchy</key><integer>1</integer><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_itr_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>tilt</string></dict><dict><key>client</key><string>AppleTV</string><key>device_whitelist</key><array><string>Apple TV</string></array><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>1</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_atv_qos</string><key>sampling_threshold</key><real>1.0</real><key>service</key><string>itunes.extras</string></dict><dict><key>client</key><string>YouTube</string><key>device_whitelist</key><array><string>iPhone</string><string>iPad</string><string>iPod touch</string></array><key>event_threshold</key><integer>50</integer><key>filters</key><array><dict><key>action</key><string>remove</string><key>key</key><string>URI</string></dict></array><key>locale_whitelist</key><array><string>US</string></array><key>override_dnu</key><integer>0</integer><key>post_url</key><string>https://xp.apple.com/report/2/img_qos</string><key>sampling_threshold</key><real>0.25</real></dict></array></dict></dict><key>version</key><string>1.0.0-41-g98d9515</string></dict></plist>

And the "key" is a binary file.