Write a spec for a generic metrics exporter

[orfeas-k]

Context

In #855, we documented charms that do not provide metrics by default. In order to be able to provide a metrics endpoint for every charm, we need to create an exporter for those charms. The exporter will be deployed as a sidecarContainer to the workload and will provide a metric so we know if the charm is working or not. It will have to cover two cases of workloads (most probably will be two different exporters):

• Web apps
• Kubernetes Go controllers and python applications (probably we 'll need to do the same check for both of these)

What needs to get done

Write a spec for the exporter described above.

Definition of Done

There is a spec.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5590.

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