SystemStatusUpdateTask does not report when there is an TYPO3 Update
The SystemStatusUpdateTask checks all status-providers, which implement the ExtendedStatusProviderInterface and only reports errors with a higher severity than Status::OK. The InstallStatusReport does not implement this interface. This means, that it will not be called from the scheduler-task and won't report that there would be a critical TYPO3 Update.
Relevant code places:
#2 Updated by Heinz Schilling about 2 years ago
Other report mail missing. Modul «Reports» shows under «Security»
Cache Flooding Protection Insecure Cache Flooding Protection is disabled. Please enable [FE][cHashIncludePageId] in the Install Tool.
E-Mail from «System Status Update (reports)» scheduler task was not send in TYPO3 7.6.12