Changes to Retrieve branch metrics

the aggregations request property's minItems was increased to 1

added the new required request property metrics

removed the required property metric from the response with the 200 status

removed the required property series from the response with the 200 status

removed the required property unit from the response with the 200 status

removed the request property metric

the request property instances became optional

added the required property results to the response with the 200 status

added the new connections_active enum value to the request property metric

added the new connections_idle enum value to the request property metric

added the new iops_read enum value to the request property metric

added the new iops_write enum value to the request property metric

added the new latency_read enum value to the request property metric

added the new latency_write enum value to the request property metric

added the new network_egress enum value to the request property metric

added the new network_ingress enum value to the request property metric

added the new replication_lag_time enum value to the request property metric

added the new throughput_read enum value to the request property metric

added the new throughput_write enum value to the request property metric

added the new wal_sync_time enum value to the request property metric