For some SQL Server agents, the Workload metrics stop displaying on the Global View dashboard after collections have been running for some time. This condition remains until agent is Deactivated / Activated.
The following error can be seen in the agent log:
WARN [AGENTNAME-lowPriorityPool-1-[DBSS_Wait_Statistics]] com.quest.glue.core.comms.filters.StaleDataFilter - Discarding sample ee88653b-88ce-4aa4-a919-1934f2c50d8c timestamped at MMM DD, YYYY HH:MM:SS AM CDT because it is 1 hour 0 minutes 11 seconds older than the server's current time and will be rejected anyway. The data sample was submitted by DB_SQL_Server/188.8.131.52/DB_SQL_Server/AGENTNAME on [MTP Agent - HOSTNAME/IPADDRESS].