This is xnu-8019. See this file in:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
	<array>
		<dict>
			<key>Name</key>
			<string>Stack Size</string>
			<key>Children</key>
			<array>
				<dict>
					<key>Name</key>
					<string>Threshold</string>
					<key>Type</key>
					<string>Interval</string>
					<key>KTraceCodeBegin</key>
					<string>0x01ad0000</string>
					<key>KTraceCodeEnd</key>
					<string>0x01ad0004</string>
					<key>EventsMatchedBy</key>
					<string>Thread</string>
					<key>ArgNamesBegin</key>
					<dict>
						<key>Arg1</key>
						<string>Stack Size</string>
					</dict>
					<key>ArgValueTypesBegin</key>
					<dict>
						<key>Arg1</key>
						<string>UInt32</string>
					</dict>
					<key>ArgNamesEnd</key>
					<dict>
						<key>Arg1</key>
						<string>Stack Size</string>
					</dict>
					<key>ArgValueTypesEnd</key>
					<dict>
						<key>Arg1</key>
						<string>UInt32</string>
					</dict>
				</dict>
			</array>
		</dict>
		<dict>
			<key>Name</key>
			<string>Stack Delta</string>
			<key>Children</key>
			<array>
				<dict>
					<key>Name</key>
					<string>Delta</string>
					<key>Type</key>
					<string>Impulse</string>
					<key>KTraceCode</key>
					<string>0x01ad0008</string>
					<key>EventsMatchedBy</key>
					<string>Thread</string>
					<key>ArgNames</key>
					<dict>
						<key>Arg1</key>
						<string>Delta</string>
					</dict>
					<key>ArgValueTypes</key>
					<dict>
						<key>Arg1</key>
						<string>UInt32</string>
					</dict>
				</dict>
			</array>
		</dict>
	</array>
</plist>