This is a sample project illustrating custom instrument package built with signpost schema. See detailed description here: https://appspector.com/blog/building-custom-xcode-instruments-package
You will need Xcode 10 GM and iOS 12 to build this.
- WWDC session 410 'Creating Custom Instruments'
https://developer.apple.com/videos/play/wwdc2018/410/ - John Sundell article about os_signpost API
https://www.swiftbysundell.com/daily-wwdc/getting-started-with-signposts - Apple Instruments documentation
https://help.apple.com/instruments/developer/mac/10.0/#/ - CLIPS reference
http://sequoia.ict.pwr.wroc.pl/~witold/ai/CLIPS_tutorial/
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