public String toString() {
        return String.format(
            "%d records were generated in %d ms across %d batches. The average time spent waiting on a " +
            "batch was %.2f ms. The record types were %s",
            totalRecords, durationMs(), totalBatches, avgBatchDurationMs(), recordTypeCounts);
    }
Holds the results of a ZK to KRaft metadata migration. The {@link #toString()} can be used to provide a
human-readable summary of the migration.
metadata/src/main/java/org/apache/kafka/metadata/migration/MigrationManifest.java