Allow users to apply a transform to container names

[tomwilkie]

See #413

[2opremio]

As discussed with @peterbourgon the idea (for now) is to render names based on the container's context. For instance, in the case of ECS, container names are mangled but ECS provides the original container name in a Docker container label: com.amazonaws.ecs.container-name

The probes will obtain the container's cloud context and include a Container report metadata entry, say "provider"="ECS" which the renderer can use to adapt the container name to display (from the com.amazonaws.ecs.container-name) and tweak other presentation details.

[2opremio]

@paulbellamy I would be interested to know if this would work well for Kubernetes too.

[paulbellamy]

A transform would work ok. There's not really a container-specific label that would work well in the container's view. There's just the pod name label, which will be shared between multiple containers.

[tomwilkie]

Sounds fine.

The probes will obtain the container's cloud context and include a Container report metadata entry, say "provider"="ECS"

How will it know this? Is it enough to 'just' use com.amazonaws.ecs.container-name as the name if its present?

[2opremio]

I agree with @tomwilkie we should just use the label if present for now. We can use a provider metadata entry when/if the cloud-provider-specific rendering gets more sophisticated.

[tomwilkie]

@fons do you think we can close this? I don't think we need anything more general, do we?

[2opremio]

Not for now, I'll close it