A freebie ebook from
The New Stack
. From an overview viewpoint, I thought this was quite good:
https://www.dropbox.com/s/qijeadn6ptffs6t/TheNewStack_Book5_Monitoring_and_Management_with_Docker_and_Containers.pdf?dl=0
or you can sign up:
http://thenewstack.io/ebookseries/
Hawkular
is even mentioned on page 76.