Not sure what kind business processes are practiced in Mozilla. Some organizations have the notation of recurring tasks as part of their business processes. Recurring tasks are just like bug reports except they are created and assigned automatically to task owners on a schedule, such as every month, every quarter, and every year.
The goal of recurring task is to get people's attention to review and perform tasks the happen periodically. It could be as simple as reviewing it and marking it done. They will show up as part of the bug report to the assignees, so they can at one place see all the bugs, feature requests, tasks, and recurring tasks.
Cert renewing would fall under the recurring task category.
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