etcdserver: add is_leader prometheus metric that is 1 on the leader. #9587
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Before this change, we had now way to find a leader using /metrics endpoint. This commit adds a metric to do that.
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gyuho
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Apr 23, 2018
…elease-3.1 Automated cherry pick of #9587
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Before this change, we had now way to find a leader using /metrics endpoint. This commit adds a metric to do that.