Add support for using custom host/service template

[Martin Lariz]

I would like to be able to define a new template to use for every host/service.
This would allow me to make custom changes (such as notes/notes_url/etc) to all hosts/services.
I have made an attempt at a patch that would implement this, but welcome all modifications obviously.

The usage of this would be setting something like:

service_template: "custom-service-template"
extraconfig: |
    define service{
        name custom-service-template
        notes juju managed service
        notes_url https://my.custom.url/
        register 0
    }

[Eric Chen (eric-chen)]

This charm is no longer being actively maintained. Please consider using the new Canonical Observability Stack instead.
(https://charmhub.io/topics/canonical-observability-stack)
I will close this feature request