Add documentation on how to use udev outside of udevvideo about akri HOT 9 CLOSED

i think i prefer the empty default to the nginx/pause version. it seems like if we have a default of pause, then we'd need to introduce another parameter to toggle the broker/services on/off ... whereas if we defaulted the image to empty, we could use the image parameter (and whether it was set) as the toggle for the broker/services on/off.

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in the udev template, should we default have the instance and configuration services? It seems like no, since by default there is no broker

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good idea! what would the default broker pod be for the udev template (the udevVideo template uses our udev video broker as a default)?

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Do we need one? It can be specified as a parameter to helm chart or expected to be replaced from the template configuration, no?

Also re #69, there should be a way to not force one.

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good call on #69. definitely agree with that.

the pod is a parameter now, so it should definitely be configurable (https://github.com/deislabs/akri/blob/0f9253dbd3875d3e8e5d5c3f1d1ee42e4e15e29a/deployment/helm/values.yaml#L186).

for the udev (as distinct from udevVideo), we could make udev.brokerPod.image.repository default to empty and could make it so that brokerPodSpec is only applied if udev.brokerPod.image.repository is supplied?

if someone didn't specify udev.brokerPod.image.repository, then no brokerPod would be added to their udev configuration.

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Agreed on empty default.

Even for udevvideo/onvifvideo, not sure how much are our brokers really defaults as opposed to samples, but perhaps that is a separate question. We might not want to have them as defaults as folks might take dependency and then we would have to worry about breaking changes.

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Other option would be to set nginx as default like we do in DebugEcho, but i like the option of no broker Pod. Then, people could use Akri to advertise udev resources and schedule their own pods to those resources.

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Right; also, if we wanted to use a placeholder, would consider using pause instead of nginx for smaller footprint.

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Makes sense; we should just document how to add them back.

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