public static Measurement first(Iterable<Measurement> ms, Tag t) {
    return first(ms, t.key(), t.value());
  }
public static Measurement first ( Iterable < Measurement > ms , Tag t ) { return first ( ms , t . key ( ) , t . value ( ) ) ; }
Returns the first measurement with a given tag value.

@param ms
A set of measurements.
@param t
The key and value to search for.
@return
Measurement or null if no matches are found.