When creating a nova flavor with heat, a unique string is appended to the flavor name.

Issue

[stack@undercloud-3 ~]$ heat stack-create -f nova-flavor.yaml  flavor
+--------------------------------------+------------+--------------------+---------------------+--------------+
| id                                   | stack_name | stack_status       | creation_time       | updated_time |
+--------------------------------------+------------+--------------------+---------------------+--------------+
| 29dbd184-5df3-4793-b571-cb204dde265f | flavor     | CREATE_IN_PROGRESS | 2016-10-03T20:40:26 | None         |
+--------------------------------------+------------+--------------------+---------------------+--------------+
[stack@undercloud-3 ~]$ heat stack-list
+--------------------------------------+------------+-----------------+---------------------+--------------+
| id                                   | stack_name | stack_status    | creation_time       | updated_time |
+--------------------------------------+------------+-----------------+---------------------+--------------+
| 29dbd184-5df3-4793-b571-cb204dde265f | flavor     | CREATE_COMPLETE | 2016-10-03T20:40:26 | None         |
+--------------------------------------+------------+-----------------+---------------------+--------------+
[stack@undercloud-3 ~]$ nova flavor-list
+--------------------------------------+-------------------------------+-----------+------+-----------+------+-------+-------------+-----------+
| ID                                   | Name                          | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+--------------------------------------+-------------------------------+-----------+------+-----------+------+-------+-------------+-----------+
| 1                                    | m1.tiny                       | 512       | 1    | 0         |      | 1     | 1.0         | True      |
| 2                                    | m1.small                      | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
| 3                                    | m1.medium                     | 4096      | 40   | 0         |      | 2     | 1.0         | True      |
| 4                                    | m1.large                      | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
| 5                                    | m1.xlarge                     | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
| 8e29f479-ab32-4565-b6d6-eede6e7261f4 | flavor-my_flavor-su3hro7yikbf | 1024      | 0    | 0         |      | 4     | 1.0         | False     |
+--------------------------------------+-------------------------------+-----------+------+-----------+------+-------+-------------+-----------+
[stack@undercloud-3 ~]$ cat nova-flavor.yaml 
heat_template_version: 2015-04-30

description: Simple template to deploy a single compute instance

resources:
  my_flavor:
    type: OS::Nova::Flavor
    properties:
      ram: 1024
      vcpus: 4