I've had an issue with the Processing plugin over that last few days. QGIS
has been really slow to start (about 15 minutes in some cases) and I then
get a message that says "Plugin Processing: the plugin will be disabled
because it crashed QGIS during last startup. 

Please report and issue and
re-enable the plugin when the problem has been resolved"

Can anyone tell me how I report the issue? What logs I need, where do I
find them and who do I send them to?