Passenger apps include remote telemetry, feeding back stats to a central server. [1] This was enabled by default in versions from 6.0.0 (Whimsy runs 6.0.5)
They say the stats are anonymised, however AFAICT traffic analysis would show that a host was using Passenger. Should the telemetry be disabled for Whimsy? [1] https://www.phusionpassenger.com/docs/advanced_guides/in_depth/ruby/anonymous_telemetry_reporting.html