This book is over 500 pages and for a bad reason. It's excessively verbose and repetitive. But if you are patient enough you can learn about all things logging and not only.
It covers the main types of telemetry, their pros and cons, use cases and audiences, optimization hints, discusses different architectures, decoupling techniques including queues and streams, handling legacy systems, multi-tenancy, structured logging and security, best practices and trending technologies, phew...
Then again, it covers the cost/feature balance and its change as the company grows and matures, driving the progression through different solutions, from SaaS to self-hosted to custom software. And you'll never be short of examples. Yes, the author has vast knowledge in the field and often speaks from her experience.
Yet the book isn't overly technical, and rightly so. The know-how is always a few clicks away if you know what to look for and that's precisely where this book shines. Know your telemetry options and know them well! Definitely recommended for the folks who deal with logs and metrics.