There are also several papers and blog posts diving into details and tradeoffs of different Bayesian optimization approaches and components here [0]. Example: Covariance Kernels for Avoiding Boundaries [1]

[0]: https://sigopt.com/research/

[1]: https://sigopt.com/blog/covariance-kernels-for-avoiding-boun...

Even Facebook uses Bayesian Optimization for tuning the parameters of some of its online systems (like its internal ranking system): https://research.fb.com/efficient-tuning-of-online-systems-u...