please take a look at https://confluence.atlassian.com/doc/email-notifications-145162.html.
You should be able to receive weekly "what has changed" emails (look for Subscribe to recommended updates). For you request of only sending it to specified group - I think that unfortunately the only way to accomplish this would be to manually look for the group members and ask them to check this option in their user profile.
But this option requires that every person have to change their own preferences in own profile, or I can as an admin, change this for everybody ?
"A link in the email message allows you to choose daily or weekly notifications." I dont see this option in my emails notifications.
In seetings i can check
but i cant choose weekly uptades. Do you know how to change this ?
You are right (I edited my former post as it was a little misguiding) - you cannot change it for others by standard means of Confluence. You could do it by using some plugin that would allow you to impersonate other users (e.g. ScriptRunner) and manually do it for them (and unfortunately yes, it is time-consuming).
As of the interval setting - it is at the end of the recommended updates emails.
Unfortunately the Confluence itself doesn't provide such a functionality. After little search I stumbled upon this plugin: https://marketplace.atlassian.com/plugins/com.adaptavist.confluence.enterpriseNotifications/server/overview
Check it, I think it could meet your requirements (even watching based on groups).
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