MetricReader (Spring Boot API)

所有已知子接口:
MetricRepository
所有已知实现类:
AggregateMetricReader, BufferMetricReader, CompositeMetricReader, InMemoryMetricRepository, MetricRegistryMetricReader, MetricsEndpointMetricReader, RedisMetricRepository, SpringIntegrationMetricReader
```
public interface MetricReader
```
A simple reader interface used to interrogate Metrics.

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`long`	`count()`	The number of metrics known to this reader.
`Iterable<Metric<?>>`	`findAll()`	Find all the metrics known to this reader.
`Metric<?>`	`findOne(String metricName)`	Find an instance of the metric with the given name (usually the latest recorded value).

- 方法详细资料
  - findOne
```
Metric<?> findOne(String metricName)
```
    Find an instance of the metric with the given name (usually the latest recorded value).
    参数:
    metricName - the name of the metric to find
    返回:
    a metric value or null if there are none with that name
  - findAll
```
Iterable<Metric<?>> findAll()
```
    Find all the metrics known to this reader.
    返回:
    all instances of metrics known to this reader
  - count
```
long count()
```
    The number of metrics known to this reader.
    返回:
    the number of metrics