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Summary
A Controller Load Test with configured Diagnostics Monitor not collating Diagnostics data.
Error
No error. But the .EVE data from Diagnostics Monitors is not available for Analysis.
Cause
Known Limitation.
There is a known limitation with collate when the run does not include at least one unique LG (i.e. one that is not also the controller). The limitation is that the collate process does not wait for all collate process to finish.
Fix
Set the LG to a different machine, not localhost, to run vusers (i.e. run must include 2 machines - controller and LG).