Get vCenter alarms with Trigger events that have an "Unset" status

alarms-unset-status.py

from pyVim.connect import SmartConnect, Disconnect
from pyVmomi import vim, vmodl

# this script is intended to be run against all vcenters daily in order to 
# guard against a possible vcenter crash due to alarms with an unset status. 
# it prints all alarms with Trigger events w/ an "Unset" status. 
# this bug is detailed at http://kb.vmware.com/kb/2062989

user = "username"
pwd = "password"

vcs = ["vcenter"]

for vc in vcs:
    si = SmartConnect(host=vc, user=user, pwd=pwd)
    content = si.RetrieveContent()
    am = content.alarmManager
    alarms = am.GetAlarm(content.rootFolder) # get all alarms
    for alarm in alarms:
        try:
            # only alarms of type EventAlarms can be unset
            if isinstance(alarm.info.expression.expression[0], vim.alarm.EventAlarmExpression):
                # status can be Normal, Warning, Alert, or Unset. Unset maps to "none"
                if alarm.info.expression.expression[0].status == None:
                    print alarm.info.name
        except AttributeError, e:
            None