Description of problem:
aodh alarm create \
 --type threshold \
 --name 'AClient-Threshold-2' \
 --description 'AodhClient-Threshold-Alarm-1' \
 --severity low \
 --enabled True \
 --alarm-action 'log://' \
 --ok-action 'log://' \
 --insufficient-data-action 'log://' \
 --repeat-actions False \
 --comparison-operator ge \
 --evaluation-periods 3 \
 --meter-name CustomMeter-1 \
 --period 60 \
 --statistic avg \
 --threshold 4 \
 --query 'resource_id=CustomMeter-Resource-1'

Failed with next error:
-----------------------
(pymysql.err.InternalError) (1054, u"Unknown column 'severity' in 'field list'") [SQL: u'INSERT INTO alarm_history (event_id, alarm_id, on_behalf_of, project_id, user_id, type, detail, timestamp, severity) VALUE
S (%s, %s, %s, %s, %s, %s, %s, %s, %s)'] [parameters: ('74000a6a-1cfe-461a-aacd-5af30acdb2fc', u'2bbd8cb8-d056-4cef-b255-96d88892b180', u'ac06a9ae73384967a05fbacb7f6a5a5b', u'ac06a9ae73384967a05fbacb7f6a5a5b', u
'20c6b773b8514c1b8b7b68200df1ea20', 'creation', '{"alarm_actions": ["log://"], "user_id": "20c6b773b8514c1b8b7b68200df1ea20", "name": "AClient-Threshold-2", "state": "insufficient data", "timestamp": "2016-06-23
T07:08:15.055917", "description": "AodhClient-Threshold-Alarm-1", "enabled": true, "state_timestamp": "2016-06-23T07:08:15.055917", "rule": {"meter_name": "CustomMeter-1", "evaluation_periods": 3, "period": 60,
"statistic": "avg", "threshold": 4.0, "query": [{"field": "resource_id", "type": "", "value": "CustomMeter-Resource-1", "op": "eq"}], "comparison_operator": "ge", "exclude_outliers": false}, "alarm_id": "2bbd8cb
8-d056-4cef-b255-96d88892b180", "time_constraints": [], "insufficient_data_actions": ["log://"], "repeat_actions": false, "ok_actions": ["log://"], "project_id": "ac06a9ae73384967a05fbacb7f6a5a5b", "type": "thre
shold", "severity": "low"}', Decimal('1466665695.055917'), 'low')] (HTTP 500) (Request-ID: req-13d48644-633b-4473-a0e5-1c857ee8d31c)

Indeed, alarm_history table missing 'severity' field:

> desc alarm_history;
+--------------+---------------+------+-----+---------+-------+
| Field        | Type          | Null | Key | Default | Extra |
+--------------+---------------+------+-----+---------+-------+
| event_id     | varchar(128)  | NO   | PRI | NULL    |       |
| alarm_id     | varchar(128)  | YES  | MUL | NULL    |       |
| on_behalf_of | varchar(255)  | YES  | MUL | NULL    |       |
| project_id   | varchar(255)  | YES  | MUL | NULL    |       |
| user_id      | varchar(255)  | YES  | MUL | NULL    |       |
| type         | varchar(20)   | YES  |     | NULL    |       |
| detail       | text          | YES  |     | NULL    |       |
| timestamp    | decimal(20,6) | YES  |     | NULL    |       |
+--------------+---------------+------+-----+---------+-------+

Though alembig_version shows the expected value:
> select * from alembic_version; 
+-------------+
| version_num |
+-------------+
| bb07adac380 |
+-------------+

After creating a new database and running aodh-dbsync the issue gone.

Version-Release number of selected component (if applicable):
-------------------------------------------------------------
mariadb-5.5.47-1.el7_2.x86_64
mariadb-libs-5.5.47-1.el7_2.x86_64
mariadb-server-5.5.47-1.el7_2.x86_64

python-aodhclient-0.5.0-1.el7ost.noarch
openstack-aodh-common-2.0.1-3.el7ost.noarch
openstack-aodh-listener-2.0.1-3.el7ost.noarch
openstack-aodh-notifier-2.0.1-3.el7ost.noarch
python-aodh-2.0.1-3.el7ost.noarch
openstack-aodh-api-2.0.1-3.el7ost.noarch
openstack-aodh-evaluator-2.0.1-3.el7ost.noarch

openstack-tripleo-heat-templates-2.0.0-11.el7ost.noarch
openstack-tripleo-heat-templates-kilo-2.0.0-11.el7ost.noarch
python-tripleoclient-2.0.0-1.0.4.el7ost.noarch
openstack-tripleo-common-2.0.0-6.el7ost.noarch
openstack-tripleo-0.0.8-0.2.d81bd6dgit.el7ost.noarch
openstack-tripleo-image-elements-0.9.9-5.el7ost.noarch
openstack-tripleo-puppet-elements-2.0.0-2.el7ost.noarch
openstack-tripleo-heat-templates-liberty-2.0.0-11.el7ost.noarch

Additional info:
VirtualSetup: 3Controllers +2Computes +1Ceph