Note: The cookieDomain must be an ancestor of the current domain, otherwise the cookie will not get set. For example, if your domain is one.two.three.root.com, you may configure the cookie to be set on root.com, but not someotherdomain.com. Setting an incorrect cookie domain will result in no hits being sent to Google Analytics.
Note: By default, the cookie path is set to /. While this setting can be modified using the cookiePath configuration parameter, it is highly discouraged. Ideally there should only be a single _ga cookie set for a given domain.
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