Create cluster metrics endpoint that can return metrics for multiple nodes #1974
In a multiple node cluster the web interface does one HTTP call for every node in the cluster to fetch the metrics every 2 seconds.
Steps to reproduce the problem
Implement a new REST endpoint that takes a list of node ids and returns the metrics for them.
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Adjust frontend MetricsStore to use the new endpoint. Saves nodes - 1 requests in a multi node setup. Fixes #1974