Administrators are notified when a user request access to a group post upgrade to 11.1.10.18802

I have seen this on other community running under 11.1.8.17149. Was this intentional or a bug?

Are you sure the accounts in questions are not group owners?  If they were accounts that initially created teh group, they are automatically added as group owners

Yes, I'm pretty sure the users who are not even a member of the group (but admin) are also receiving group request notifications.

I can verify that all members with Modify Membership permission within the group will potentially receive the group membership request notification. This does not limit to direct members. Admins, therefore, would be included.

But I wonder why this wasn't for the previous versions

This is related to the correction to this bug:

Hi Ben,
That's fine, can we get an option to mute sending notifications to Administrators.
Because  some communities have more than 50 groups and around 100thousand users. If admin's will receive all these  messages his mail box will be full. 

Go to the User's Settings, click on the Notifications tab, uncheck the emails they don't want to receive.

I too am receiving group request messages whenever anybody on the system asks to join a group. I am an administrator and am not part of the groups. There are, however, a select number of groups where I am a manager and I would want the join request emails. Therefore, I cannot turn off the "Someone requests membership in a group whose membership I manage" notification. We are running 13.0.1.32004. Is there a way for our administrators to stop getting group requests if they are not managers of the groups?

I too am receiving group request messages whenever anybody on the system asks to join a group. I am an administrator and am not part of the groups. There are, however, a select number of groups where I am a manager and I would want the join request emails. Therefore, I cannot turn off the "Someone requests membership in a group whose membership I manage" notification. We are running 13.0.1.32004. Is there a way for our administrators to stop getting group requests if they are not managers of the groups?