[system test] [MOI] found avg_item_size and raw_data_size stats having negative values

2:o2_result_rating:timings/storage_snapshot_create': u'0 0 0', u'other-1:#primary:timings/storage_del': u'16093818 64759629567 7266329304120743', u'other-1:#primary:num_last_snapshot_reply': 0, u'other-3:o3_result_rating:num_rows_returned': 36791, u'default:default_result_ratings_claims_pindex:num_completed_requests_aggr': 8847, u'other-2:o2_result_rating:timings/dcp_getseqs': u'36369 223352032736 6367104497388693610', u'other-1:#primary:avg_item_size': -372, u'other-2:o2_claims:avg_scan_request_alloc_latency': 0, u'other-2:o2_claims:avg_drain_rate': 2309, u'other-2:ts_queue_size': 0, u'other-3:o3_result_rating:cache_hits': 0, u'default:default_result_ratings_claims_pindex:flush_queue_size': 0, u'other-1:#primary:avg_mutation_rate': 4978, u'other-2:o2_claims:delete_bytes': 0, u'default:default_claims (replica 2):timings/storage_snapshot_create': u'0 0 0', u'other-1:#primary:timings/storage_meta_get': u'0 0 0', u'other-3:o3_result_rating:timings/storage_new_iterator': u'36791 

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u'other-1:#primary:avg_ts_interval': 13682157, u'other-3:o3_result_rating:timings/storage_meta_get': u'0 0 0', u'default:default_claims (replica 2):num_last_snapshot_reply': 0, u'other-1:#primary:avg_scan_rate': 0, u'default:default_result_ratings_claims_pindex:cache_hits': 0, u'other-2:o2_claims:avg_scan_request_latency': 0, u'other-1:#primary:num_docs_queued': 0, u'other-2:o2_claims:timings/dcp_getseqs': u'0 0 0', u'other-1:#primary:raw_data_size': -691713570, u'default:default_claims (replica 2):get_bytes': 0, u'default:default_claims (replica 2):since_last_snapshot': 11136021, u'other-2:o2_result_rating:num_requests_aggr': 36369, u'other-2:o2_claims:timings/storage_commit': u'0 0 0', u'default:default_claims (replica 2):num_rows_scanned_aggr': 0, u'other-1:#primary:num_flush_queued': 19155773, u'default:default_result_ratings_claims_pindex:scan_wait_duration': 2148683022456, u'default:default_result_ratings_claims_pindex:progress_stat_time': u'1574195899480971474', u'default:default_result_ratings_claims_pindex:insert_bytes': 0