Add log translation hints for glance

Registered by ling-yun

Oslo would like to see hints like this in all of our code
by the end of juno. We should trickle the changes out
over the release.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
ling-yun
Direction:
Needs approval
Assignee:
ling-yun
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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