Mapping application deployment / build information

I'm looking to log some build and deployment information and not sure if it made sense somewhere in labels, current schema, or maybe a some new fields.

Specifically, I want to add some fields such as:

* Build number
* Build URL (link to the build in build system)
* Deployment number
* Deployment URL (link to the deployment in build system)
* Deployment timestamp
* Git SHA1

I see that the git SHA1 could probably go under `hash.sha1` and maybe deployment number as `service.id`. But do the others line up with existing fields? Has there been any thought to something like an `application` top-level or maybe extended `service` fields to hold this information?