Problem/Justification
(What is the problem you are trying to solve with this feature/improvement or why should it be considered?)
If a cronjob or other recurring/one shot task has a problem or it is manually stopped, the jobs dropdown will stack up with failed jobs very quickly. Currently the only way to clear out the list is a reboot.
Impact
(How is this feature going to impact all TrueNAS users? What are the benefits and advantages? Are there disadvantages?)
While yes it is kinda the IT equivalent of a 1st world problem, it can be a bit annoying having dozens of failed jobs listed as well as the counter in the list showing so.
User Story
(Please give a short description on how you envision some user taking advantage of this feature, what are the steps a user will follow to accomplish it)
A user could clear out failed tasks from the dropdown (but still be retained on the actual jobs page) to keep it clean and easier to parse at a glance upon fixing a problem or knowingly canceling a task, just like you can with alerts. I would also suggest to just add a 4th icon to the jobs dropdown for cleared failed jobs since powered on, or at least the option for it.