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I opened bug 1341777 [1] against glance but it looks like it's due to 
the default log level for requests.packages.urllib3.connectionpool in 
oslo's log module.

The problem is this warning shows up nearly 420K times in 7 days in 
Tempest runs:

WARNING urllib3.connectionpool [-] HttpConnectionPool is full, 
discarding connection: 127.0.0.1

So either glance is doing something wrong, or that's logging too high of 
a level (I think it should be debug in this case).  I'm not really sure 
how to scope this down though, or figure out what is so damn chatty in 
glance-api that is causing this.  It doesn't seem to be causing test 
failures, but the rate at which this is logged in glance-api is surprising.

[1] https://bugs.launchpad.net/glance/+bug/1341777

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Thanks,

Matt Riedemann