VMware agent stops collecting data due to disassociated lockbox/credentials. An entry similar to below is logged in the logs:
2017-10-02 11:03:14.722 INFO [Quartz-9125] com.quest.agent.esx.task.util.VIServiceUtils - Attempting to connect to ConnectionInfo [host=VC_name, urlPath=sdk, port=443, ssl=true], user: null, Trust All Certificates: true
ERROR [Quartz-250393] com.quest.vmware.api.connection.VIService - Null argument passed to login() for parameter: username
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