The error was observed during Mixed Workload Testing 9:
Running: dcos task exec -it prometheus-0-server__8b619a20-342f-4ecf-8715-8eecc0f8c55c bash
Returned: HTTP 500: "Internal Server Error".
Greg Mann: you can find verbose CLI logs from an instance of this here: https://gist.github.com/greggomann/d05f98b6134ea6077e030e32ecc76dba
Findings from the Mesos agent suggest that these 500s are due to failed authorization, which occurred because the authorizer could not resolve ‘master.mesos’