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Hello,

I'm looking for way to a add new attribute to the compute nodes by  adding
a column to the compute_nodes table in nova database in order to track a
metric on the compute nodes and use later it in nova-scheduler.

I checked the  sqlalchemy/migrate_repo/versions and thought about adding my
own upgrade then sync using nova-manage db sync.

My question is :
What is the process of upgrading a table in the database ? Do I have to
modify or add a new variable in some class in order to associate the newly
added column with a variable that I can use ?

Best regards,
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