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This causes the book to fail to start:
ERROR Failed to deserialize `output.html`
Caused by: unknown field `google-analytics`, expected one of `theme`, `default-theme`, `preferred-dark-theme`, `smart-punctuation`, `definition-lists`, `admonitions`, `mathjax-support`, `additional-css`, `additional-js`, `fold`, `playground`, `playpen`, `code`, `print`, `no-section-label`, `search`, `git-repository-url`, `git-repository-icon`, `input-404`, `site-url`, `cname`, `edit-url-template`, `live-reload-endpoint`, `redirect`, `hash-files`, `sidebar-header-nav`
That's because the google-analytics option was removed in version 0.5 of mdbook (see also rust-lang/mdBook#1675 & rust-lang/mdBook#2776).
Instead of doing this, we need to add a head.hbs file in the theme directory, and put whatever code snippit you need in there. That file will be put into <head>.
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To get better insight on page views and SEO optimizations, we want to gather some page statistics from google analytics.