object NullMetricsPersister extends MetricsPersister
Does not persist metrics. Will always return an empty map if used to load metrics. Use this when you don't want to persist metrics
          
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        loadAll: Future[Map[Instant, Map[SingleDsDescription, Map[SimpleMetricDescriptor, MetricValue]]]]
      
      
      Loads all metrics in the repository Loads all metrics in the repository - returns
- Future of a map with timestamps to metrics 
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- NullMetricsPersister → MetricsPersister
 
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        def
      
      
        save(timestamp: Instant, metrics: Map[SingleDsDescription, Map[SimpleMetricDescriptor, MetricValue]]): Future[Map[SingleDsDescription, Map[SimpleMetricDescriptor, MetricValue]]]
      
      
      Save the given metrics to some storage layer depending on implementation chosen Save the given metrics to some storage layer depending on implementation chosen - timestamp
- - the timestamp to associate the metrics to 
- metrics
- - a map with an entry for each dataset. An inner map for each type of metric for that dataset. 
- returns
- returns a future of the passed metrics 
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- NullMetricsPersister → MetricsPersister
 
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