Hello,
I'm using a lot the puppet function to query foreman from puppet (https://github.com/ohadlevy/puppet-foreman/blob/master/foreman/lib/puppet/parser/functions/foreman.rb)
in my manifest.
I noticed that when nodes where running puppet they might not be listed when querying Foreman in the REST API.

ie: If I have 2 nodes in hostgroup webservers and I query all hosts in that hostgroup
and I run puppet in the 2 nodes at the same time, foreman may list only one node instead of 2 in the answer.

I reproduced that with debug using http client when puppet was running on my nodes :
http://pastebin.com/C1rAeGMN

• you can see that the 3 queries are only 1 second spaced
• obvioulsy shinken51 was not deleted during the process
• during the second request foreman replied only 2 facts instead of 3

I'm running foreman 1.1 with passenger + mysql
Puppet is puppet 3.0 (behavior was the same with puppet2.7)
Using puppetdb

This is quite painfull for us as a big part of our manifest is
writted to rely on Foreman and to reload dynamically the daemons.