CounterSet (Apache ZooKeeper - Server 3.9.1 API)

All Known Implementing Classes:

SimpleCounterSet
```
public interface CounterSet
```
A counter refers to a value which can only increase. Usually the value is reset when the process starts. A CounterSet is a set of Counter grouped by keys.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`void`	`add(String key, long delta)`	Increment the value by a given amount for the given key
`default void`	`inc(String key)`	Increment the value by one for the given key

- Method Detail
  - inc
```
default void inc(String key)
```
    Increment the value by one for the given key
    This method is thread safe, The MetricsProvider will take care of synchronization.
    
    Parameters:
    
    key - the key to increment the count
  - add
```
void add(String key,
         long delta)
```
    Increment the value by a given amount for the given key
    This method is thread safe, The MetricsProvider will take care of synchronization.
    
    Parameters:
    
    key - the key to increment the count for the given key
    
    delta - amount to increment, this cannot be a negative number.