Gauge (clients 7.5.12-ce API)

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All Superinterfaces:
MetricValueProvider<T>
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface Gauge<T>
extends MetricValueProvider<T>
```
A gauge metric is an instantaneous reading of a particular value.

- Method Summary
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method and Description
  T value(MetricConfig config, long now)
  Returns the current value associated with this gauge.

- Method Detail
  - value
```
T value(MetricConfig config,
        long now)
```
    Returns the current value associated with this gauge.
    Parameters:
    config - The configuration for this metric
    now - The POSIX time in milliseconds the measurement is being taken

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