The Webserver is writing log data with IP-Adresses of the visitors.
This is only done to find errors in case of an emergency.
Otherwise the data will not be analyzed.
I am using freelytics for analytics. This allows me to see what pages have been visited how many times. No personally identifiable information is stored or even sent to the service.
Using the comments function
If you decide to use the commenting functions some data will be stored.
Here is a small rundown of all the data collected. This is taken from https://commento.io/privacy which is writing the Commento software that provides the functionality.
Authenticating as a visitor of a website embedding the service: When you choose to authenticate yourself as a visitor on a website embedding the service, a unique, randomly generated token (“Session”) will be stored as a cookie in your browser in order to remember you on future visits. Upon successfully authenticating yourself with a OAuth provider, all the information returned by the provider is stored and associated with your Session. This may include, but is not limited to, your full name, your email address, your photo, and an URL to your public profile. By authenticating yourself as a Vistor on a website embedding the service, you consent to allow the service to display all information except your email address publicly on all comments you create. This information will never be sold to advertisers, marketing agencies, or any other organization for user tracking or any other purpose.