Simplify node_draining
metric by switching to just in time collection.
#153
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By collecting just in time we don't need to worry about stale metrics due to node deletions. Since the client reads are cached by default this does not add load to the API server.
Review might be easier by just looking at the updated file instead of the diff.
Checklist
bug
,enhancement
,documentation
,change
,breaking
,dependency
as they show up in the changelog