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Aggregates variables a keras metric placed at CLIENTS to SERVER.

metrics a single tf.keras.metrics.Metric or a Sequence of metrics . The order must match the order of variables in federated_values.
federated_values a single federated value, or a Sequence of federated values. The values must all have tff.CLIENTS placement. If value is a Sequence type, it must match the order of the sequence in `metrics.

The result of performing a federated sum on federated_values, then assigning the aggregated values into the variables of the corresponding tf.keras.metrics.Metric and calling tf.keras.metrics.Metric.result. The resulting structure has tff.SERVER placement.