Combination alarm doesn't change sate when one of alarms is in 'insufficient data' state

Ceilometer 2014.2 Juno release.
When one of the alarms within combination one changes state to 'alarm' state and 2nd alarm is in 'insufficient data' state, then
combination alarm doesn't change state to 'alarm'.

Operator used with combination alarm 'OR'.

# ceilometer alarm-history 41517047-d40e-4cd6-a8dc-f9151a00ac9b -q 'timestamp>2015-04-10T12:00:00'
+------+-----------+--------+
| Type | Timestamp | Detail |
+------+-----------+--------+
+------+-----------+--------+
# ceilometer alarm-history 2792d7e9-92f8-4a67-9ded-73368a42f629 -q 'timestamp>2015-04-10T12:00:00'
+------+-----------+--------+
| Type | Timestamp | Detail |
+------+-----------+--------+
+------+-----------+--------+
# ceilometer alarm-history 1c260480-5760-440a-bd2e-f07e08c29a72 -q 'timestamp>2015-04-10T12:00:00'
+------+-----------+--------+
| Type | Timestamp | Detail |
+------+-----------+--------+
+------+-----------+--------+

# ceilometer alarm-list
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+
| Alarm ID | Name | State | Enabled | Continuous | Alarm condition | Time constraints |
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+
| 1c260480-5760-440a-bd2e-f07e08c29a72 | IuriiAlarm2 | insufficient data | True | False | alarm_meter_2 >= 5.0 during 3 x 60s | None |
| 2792d7e9-92f8-4a67-9ded-73368a42f629 | CombinationOR_Alarm1 | insufficient data | True | False | combinated states (OR) of 1c260480-5760-440a-bd2e-f07e08c29a72, 41517047-d40e-4cd6-a8dc-f9151a00ac9b | None |
| 41517047-d40e-4cd6-a8dc-f9151a00ac9b | IuriiAlarm1 | insufficient data | True | False | alarm_meter_1 >= 3.0 during 3 x 60s | None |
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+

[Triggering transition to 'alarm' state]
# ceilometer sample-create --meter-name 'alarm_meter_2' --resource-id 'alarm_resource_2' --meter-type 'cumulative' --meter-unit 'S' --sample-volume 8.0
+-------------------+--------------------------------------------+
| Property | Value |
+-------------------+--------------------------------------------+
| message_id | a97f5910-df7a-11e4-8e5f-3417ebe649d5 |
| name | alarm_meter_2 |
| project_id | 85b6e8ab730b4dc7984dbce7ee072cf5 |
| resource_id | alarm_resource_2 |
| resource_metadata | {} |
| source | 85b6e8ab730b4dc7984dbce7ee072cf5:openstack |
| timestamp | 2015-04-10T12:11:05.064887 |
| type | cumulative |
| unit | S |
| user_id | 9c1c7f2a7600433f9f98d7bc9a37544d |
| volume | 8.0 |
+-------------------+--------------------------------------------+

# ceilometer alarm-history 1c260480-5760-440a-bd2e-f07e08c29a72 -q 'timestamp>2015-04-10T12:00:00'
+------------------+----------------------------+--------------+
| Type | Timestamp | Detail |
+------------------+----------------------------+--------------+
| state transition | 2015-04-10T12:11:42.053000 | state: alarm |
+------------------+----------------------------+--------------+
# ceilometer alarm-history 2792d7e9-92f8-4a67-9ded-73368a42f629 -q 'timestamp>2015-04-10T12:00:00'
+------+-----------+--------+
| Type | Timestamp | Detail |
+------+-----------+--------+
+------+-----------+--------+
# ceilometer alarm-history 41517047-d40e-4cd6-a8dc-f9151a00ac9b -q 'timestamp>2015-04-10T12:00:00'
+------+-----------+--------+
| Type | Timestamp | Detail |
+------+-----------+--------+
+------+-----------+--------+

# ceilometer alarm-list
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+
| Alarm ID | Name | State | Enabled | Continuous | Alarm condition | Time constraints |
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+
| 1c260480-5760-440a-bd2e-f07e08c29a72 | IuriiAlarm2 | alarm | True | False | alarm_meter_2 >= 5.0 during 3 x 60s | None |
| 2792d7e9-92f8-4a67-9ded-73368a42f629 | CombinationOR_Alarm1 | insufficient data | True | False | combinated states (OR) of 1c260480-5760-440a-bd2e-f07e08c29a72, 41517047-d40e-4cd6-a8dc-f9151a00ac9b | None |
| 41517047-d40e-4cd6-a8dc-f9151a00ac9b | IuriiAlarm1 | insufficient data | True | False | alarm_meter_1 >= 3.0 during 3 x 60s | None |
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+

[Waiting until alarm transitioned to 'inssufficient data' state]
# ceilometer alarm-list
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+
| Alarm ID | Name | State | Enabled | Continuous | Alarm condition | Time constraints |
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+
| 1c260480-5760-440a-bd2e-f07e08c29a72 | IuriiAlarm2 | insufficient data | True | False | alarm_meter_2 >= 5.0 during 3 x 60s | None |
| 2792d7e9-92f8-4a67-9ded-73368a42f629 | CombinationOR_Alarm1 | insufficient data | True | False | combinated states (OR) of 1c260480-5760-440a-bd2e-f07e08c29a72, 41517047-d40e-4cd6-a8dc-f9151a00ac9b | None |
| 41517047-d40e-4cd6-a8dc-f9151a00ac9b | IuriiAlarm1 | insufficient data | True | False | alarm_meter_1 >= 3.0 during 3 x 60s | None |
+--------------------------------------+----------------------+-------------------+---------+------------+------------------------------------------------------------------------------------------------------+------------------+

# ceilometer alarm-history 41517047-d40e-4cd6-a8dc-f9151a00ac9b -q 'timestamp>2015-04-10T12:00:00'
+------+-----------+--------+
| Type | Timestamp | Detail |
+------+-----------+--------+
+------+-----------+--------+
# ceilometer alarm-history 2792d7e9-92f8-4a67-9ded-73368a42f629 -q 'timestamp>2015-04-10T12:00:00'
+------+-----------+--------+
| Type | Timestamp | Detail |
+------+-----------+--------+
+------+-----------+--------+
# ceilometer alarm-history 1c260480-5760-440a-bd2e-f07e08c29a72 -q 'timestamp>2015-04-10T12:00:00'
+------------------+----------------------------+--------------------------+
| Type | Timestamp | Detail |
+------------------+----------------------------+--------------------------+
| state transition | 2015-04-10T12:15:42.098000 | state: insufficient data |
| state transition | 2015-04-10T12:11:42.053000 | state: alarm |
+------------------+----------------------------+--------------------------+

It would be great if 'alarm' state is considered as higher priority than 'insufficient data' state, at least for the 'OR' operator within combination alarm.

Or I'm missing something?

Thanks,
Yurii