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Load a In treeherder, select the job you're interested want to re-run (Note : it currently only work works for [https://searchfox.org/mozilla-central/source/taskcluster/taskgraph/actions/retrigger_mochitest.py#30-31 some jobs]). The details panel should open up. Look for the 3 dots icon ("Other job details") and select "Custom actions...".
→Re-running tasks with custom parameters from Treeherder
== Re-running tasks with custom parameters from Treeherder ==
[[File:Custom Taskcluster Job Actions.png|thumb|Treeherder modal to request an action associated to a task]]
The <tt>retrigger-mochitest</tt> action (TODO: A better name is needed) is the one selected in the dropdown drop-down menu. You can now modify some parameters of Modify the task parameters as desired and select "Trigger". This will schedule the task with your specified parameters. The new task will be labeled as <tt>custom-<original_task_name></tt>.
Some of the parameters that you can change are (see screenshot above):
* Modify Python's logging level
* Path of the test to execute
* Gecko preference preferences (think of <tt>about:config</tt>)
* Run a test repeatedly
* Run until the test fails
