I added to 1.10 branch the possibility to manage scheduled outages using a REST API like this:

GET /sched-outages
to get a list of configured scheduled outages.

POST /sched-outages
to add a new outage (or update an existing one).

GET /sched-outages/{outageName}
to get the details of a specific outage.

DELETE /sched-outages/{outageName}
to delete a specific outage.

PUT /sched-outages/{outageName}/collectd/{package}
to add a specific outage to a collectd's package.

PUT /sched-outages/{outageName}/pollerd/{package}
to add a specific outage to a pollerd's package.

PUT /sched-outages/{outageName}/threshd/{package}
to add a specific outage to a threshd's package.

PUT /sched-outages/{outageName}/notifd
to add a specific outage to the notifications.

DELETE /sched-outages/{outageName}/collectd/{package}
to remove a specific outage from a collectd's package.

DELETE /sched-outages/{outageName}/pollerd/{package}
to remove a specific outage from a pollerd's package.

DELETE /sched-outages/{outageName}/threshd/{package}
to remove a specific outage from a threshd's package.

DELETE /sched-outages/{outageName}/notifd
to remove a specific outage from the notifications.

Also I added some comments on related about an enhancement for the above API to validate if a node and/or an IP address is currently in outage.