Understanding results of a Try push can be difficult.  I have started 
writing some documentation on tools to help understand it:
https://firefox-source-docs.mozilla.org/testing/treeherder-try/index.html

Specifically I want to call out "Confirm Failure".

This runs much faster than a retrigger and yields as strong if not a 
stronger signal.  It runs as tier-3 right now, so you need to view tier-3 
jobs in your try push.

Currently there are plans to make this more streamlined (and once there it 
will be tier-2), specifically:
 * better UI filtering for tasks that don't have a clear signal after 
running confirm failures
 * a more automated way to run confirm failure for try pushes (will at 
least require a bug, most likely a phabricator ID)
 * other tools for running it easier manually

The more these tools are used, the more usability and edge cases can be 
fixed.


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