Service Communications API - Planned Maintenance - not reliable ??

hi folks

i really don't understand the following case so i hope you can help.

there is this nice services communication API available, where 3 categories for get-Messages are available:  Incident, Planned Maintenance and Message Center

https://msdn.microsoft.com/en-us/office-365/office-365-service-communications-api-reference

In the Portal i see atm a planned maintenance for Yammer (scheduled for the 20th of November)

BUT this message is classified as "Message Center" AND NOT as "Planned Maintenance" ?

(unfortunately i see no other examples)

So why there is the planned maintenance category available IF IT IS NOT USED by Microsoft ?!?!

I want to pull only planned maintenance data via the API and want to exclude everything else.

any ideas ? any other experience about this API ?   is it reliable ?

thank you

stefan

so the