Method of

api/src/main/java/io/grpc/CallOptions.java:357–362

Factory method for creating instances of Key. @param debugString a string used to describe this key, used for debugging. @param defaultValue default value to return when value for key not set @param Key type @return Key object @deprecated Use #create or {@link #createWithDefault

(String debugString, T defaultValue)

     *     be removed.
     */
    @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1869")
    @Deprecated
    public static <T> Key<T> of(String debugString, T defaultValue) {
      Preconditions.checkNotNull(debugString, "debugString");
      return new Key<>(debugString, defaultValue);
    }

    /**
     * Factory method for creating instances of {@link Key}. The default value of the