to deal with first label in metric #756
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When monitoring the increase of a metric using prometheus-query, the first entry for a label is not detected since increase() can only detect the difference between 2-scrapes. This is a minor issue that only affects the first time a label is created but it is a bit confusing for training when we always start with a brand new instance.
This PR fixes this by waiting 5 seconds (scrape interval) for a new label-entry in a metric.