hi, this is just a headsup, i'm fast approving my own magic[1] to fix gate of the error 'fatal error: libxml/xpath.h: No such file or directory'[2]. some notes: - i don't know why it doesn't affect aodh (so far) even though aodh has the same lxml requirement - there was a new lxml lib release recently and no changes to gate images but i didn't look any further to validate if lxml is real reason - i copied the bindep entries from Nova's bindep. now that you realise i'm 75% guessing. feel free to revert or adjust accordingly for potential future breakage in aodh (i really have no idea why it's cool over there). [1] https://review.openstack.org/#/c/408063/ [2] http://logs.openstack.org/63/408063/4/check/gate-ceilometer-docs-ubuntu-xenial/90404dc/console.html#_2016-12-12_20_10_42_051348 cheers, -- gord