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Bare minimum core library needed to sending metrics to SignalFx from Java clients

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package com.signalfx.shaded.checkerframework.checker.calledmethods.qual;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import com.signalfx.shaded.checkerframework.framework.qual.DefaultQualifierInHierarchy;
import com.signalfx.shaded.checkerframework.framework.qual.SubtypeOf;

/**
 * If an expression has type {@code @CalledMethods({"m1", "m2"})}, then methods {@code m1} and
 * {@code m2} have definitely been called on its value. Other methods might or might not have been
 * called. "Been called" is defined as having been invoked: a method has "been called" even if it
 * might never return or might throw an exception.
 *
 * The subtyping relationship is:
 *
 * 
{@code @CalledMethods({"m1", "m2", "m3"}) <: @CalledMethods({"m1", "m2"})}
 *
 * @checker_framework.manual #called-methods-checker Called Methods Checker
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({})
@DefaultQualifierInHierarchy
public @interface CalledMethods {
  /**
   * Methods that have definitely been called on the expression whose type is annotated.
   *
   * @return methods that have definitely been called
   */
  public String[] value() default {};
}