Stereotype annotation that helps to link together instance of the filter and http client that filter should be applied to.
 In order to use you will need to create new annotation and apply 
FilterMatcher on it. After that apply newly
 created annotation on both instance of the http filter and instance of a http client.
 
 Example:
 {@literal @}FilterMatcher
 public @interface Metered {
     ...
 }
 {@literal @}Metered
 public class MeteredHttpFilter implements HttpClientFilter {
     ....
 }
 {@literal @}Metered
 private HttpClient httpClient;
 
 In the example above only clients annotated with 
{@literal @}Metered annotations are going to be filtered by MeteredHttpFilter