I see the following definition in my SFDC log
"message": "env:361<<tenantId>+<profileId>> <m>: No describe information for particular tenant"
This indicates that there was a temporary problem with loading the sObject metadata on a worker node. Before loading a Salesforce event, the SFDC connector checks if it has the sObject Metdata for each type that is defined in the mapping. If it does not, the worker will not load the events from Salesforce. This is an internal mechanism to avoid any synchronization error and event loss. Other workers will process the event as expected.