Hi Doug, logs are not available on your side in GoodData Cloud. If the metrics were simply removed from the insights, then it was most likely due to a manual change on your end (someone may have edited the insight), however, if you introduced changes in the LDM, then the metrics were removed due to these changes and they need to be recreated, in such case, no manual removal took place.
There are other instances in which the removal may have been done programmatically, for example, the insight was edited from a parent workspace in a workspace hierarchy cascading the changes to the child workspaces or it was edited via the SDK or the GoodData extension.