MetricFetcher (Flink : Runtime 2.0-preview1 API)

All Known Implementing Classes:

MetricFetcherImpl, VoidMetricFetcher
```
public interface MetricFetcher
```
The MetricFetcher can be used to fetch metrics from the JobManager and all registered TaskManagers.
Metrics will only be fetched when update() is called, provided that a sufficient time since the last call has passed.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`getLastUpdateTime()`
`MetricStore`	`getMetricStore()`	Get `MetricStore` which contains all currently fetched metrics.
`void`	`update()`	Trigger fetching of metrics.

- Method Detail
  - getMetricStore
```
MetricStore getMetricStore()
```
    Get MetricStore which contains all currently fetched metrics.
    
    Returns:
    
    MetricStore with all fetched metrics
  - update
```
void update()
```
    Trigger fetching of metrics.
  - getLastUpdateTime
```
long getLastUpdateTime()
```
    Returns:
    
    timestamp of the last update.