Mysql Instance Summary Dashboard Buffer Pool Size of Total RAM value is N/A

User Impact: Missing Metrics on the Dashboard

Preconditions:
pmm pmm server with mysql database monitored.

STR:

Navigate to: 

/graph/d/mysql-instance-summary/mysql-instance-summary?from=now-15m&to=now&var-service_name=ps_group_replication_node_2&orgId=1&refresh=1m& 

Expected Result:
Buffer Pool Size of Total RAM shows value 

Actual Result:
Buffer Pool Size of Total RAM shows N/A
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