InnoDB TableSpace data is not collected for Percona Server 8

User Impact:

User can not see any data by mysql_info_schema_innodb_tablespace_allocated_size_bytes mtric during Percona Server 8 monitoring

Steps to Reproduce:

1. Setup PMM to monitor PS8.
2. login as admin
3. click on 'Insight' on the main breadcrumb
4. select 'Advanced Data Exploration'
5. in filters select : mysql_info_schema_innodb_tablespace_allocated_size_bytes  metric
6. add service_name = ps_8.0_0.0.0.0_1 to filter

Actual Result:
No data displayed. See attached screenshot. 

Expected Result:
data should be displayed.

Additional information:

Filter with service_name = ps_5.7_0.0.0.0_1 -  shows data

Original report:

Original description from Peter Zaitsev :

I have 2  Percona Server provisioned with PMM, for PS5.7 I see the innodb_tablespace related information is reported (example below)  however PS8 reports no metrics through it also has this table.

mysql_info_schema_innodb_tablespace_allocated_size_bytes{agent_id="/agent_id/df9cfd20-8c2c-46ff-a53b-6e6f308fddab",agent_type="mysqld_exporter",az="myaz",environment="versions",instance="/agent_id/df9cfd20-8c2c-46ff-a53b-6e6f308fddab",job="mysqld_exporter_agent_id_df9cfd20-8c2c-46ff-a53b-6e6f308fddab_lr-1m0s",machine_id="/machine_id/612892249edc4cf7b40cdfd1534feded",node_id="/node_id/5389b202-d9ad-4857-978b-de49cfc811e2",node_model="linode1024",node_name="ps57-2-n-1-tpcc-tb1-s10-th1x",node_type="generic",region="datacenter4",service_id="/service_id/dd4ea72b-9431-4dde-a72e-5971697acd9e",service_name="ps57-2-n-1-tpcc-tb1-s10-th1x-mysql",service_type="mysql",tablespace_name="mysql/engine_cost"}