The hooks to schedule, and whether the cache still describes this site.
KNOWN_CRON_HOOKS is only the shipped install's list, so a customer module's hook_cron needs
discovery. The cache is keyed on the enabled-module set, not the generation (which moves on every
content save and would re-boot the kernel each time).
The hooks to schedule, and whether the cache still describes this site.
KNOWN_CRON_HOOKSis only the shipped install's list, so a customer module'shook_cronneeds discovery. The cache is keyed on the enabled-module set, not the generation (which moves on every content save and would re-boot the kernel each time).