is there an environment variable for fleet to set

disable_carver

to true? it appears that orbit sets it to false by default unlike the stock osquery package similar to the environment variable that sets the log plugin for osquery clients is what I'm looking for https://fleetdm.com/docs/configuration/fleet-server-configuration#osquery-result-log-plugin

You can disable carving by setting the osquery flag in your Agent options: https://fleetdm.com/docs/configuration/agent-configuration#options