Protokube metrics

[jacksontj]

1. Describe IN DETAIL the feature/behavior/change you would like to see.
Protokube is main online dep for kops (it manages running the kubelet, and goes any gossip discovery configured). It should expose metrics to introspect the health of that process.

2. Feel free to provide a design supporting your feature request.
This should be simply (1) adding prometheus handler (2) instrumenting w/e additional calls we want to

Some ideas for metrics:

• number of peers (per gossip -- Swap protokube's gossip implementation from weaveworks/mesh to memberlist #7436)
• last seed time
• dnsZone metrics (last updated, last error, etc.)

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[jacksontj]

/remove-lifecycle stale

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

In response to this:

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