Jenkins doesn't trigger post-build actions

[Tae-Geon Um]

Hi all, 

From 4 days ago, Jenkins doesn't trigger post-build actions ( Set build status 
on GitHub commit ).
I didn’t change any configuration. 

Is there any reason for this?
Our project is https://builds.apache.org/job/Reef-pull-request-ubuntu/ 
<https://builds.apache.org/job/Reef-pull-request-ubuntu/>

Thanks,
Taegeon