Do we have any method to reset a triggered alarm in vCenter using vRO workflow ?
I could see something in vCenter 6.7 API (ClearTriggedAlarm ). But nothing for vCenter 6.5
vRO uses what is exposed in vCenter API's. In 6.5, it seems there is no exposed vCenter API to reset the alarm status, so there is also no vRO workflow/scripting to do so.
ClearTriggeredAlarm is marked with Since: vSphere API 6.7 in the official documentation - https://vdc-repo.vmware.com/vmwb-repository/dcr-public/fe08899f-1eec-4d8d-b3bc-a6664c168c2c/7fdf97a1...
So this particular API is not available in the earlier vSphere versions (including 6.5), and following the link to AlarmManager managed object on the same page, you can see what is currently available as alarm-related API.
I did not find any vRo method to reset the alarm status to green for vCenter 6.5
vRO uses what is exposed in vCenter API's. In 6.5, it seems there is no exposed vCenter API to reset the alarm status, so there is also no vRO workflow/scripting to do so.