SecAdvisories?
I noticed that I haven't received an update in a while, so I manually triggered one. When I check the status, I see that the pending deployment has a SecAdvisory. Should I be concerned?
Was that preventing automatic updates? In the screenshot, you can see my current deployment is from May 28 and I use this machine daily.
Was that preventing automatic updates? In the screenshot, you can see my current deployment is from May 28 and I use this machine daily.

Solution
SecAdvisories are security updates
the top deployment (when 3 are visible and you have no pinned deployments) is the incoming update that you will be booted into when you reboot (or boot the device next)
the top deployment (when 3 are visible and you have no pinned deployments) is the incoming update that you will be booted into when you reboot (or boot the device next)