Add periodic task heartbeat file

Registered by Alexis Lee

At present it's difficult to verify that all Nova services are responsive, rather than merely running. Touch a heartbeat file, the freshness of which can easily be monitored by EG an Icinga check.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Alexis Lee
Direction:
Needs approval
Assignee:
Alexis Lee
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Alexis Lee

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