We've had LogDog enabled for these masters for a long time:
    'client.webrtc': {},
    'client.webrtc.branches': {},
    'client.webrtc.fyi': {},
    'client.webrtc.perf': {},
    'tryserver.webrtc': {},
(snippet from the config; https://cs.chromium.org/chromium/build/scripts/slave/logdog-params.pyl?rcl=e53e846adcfbea9fb57f2ff74278aa33e19b100a&l=226)

This produces the [stdout] link next to the regular Buildbot stdio link to the output of the step.
In order to reduce confusion among our users and to reduce the I/O load on the masters, we should make our bots be LogDog only. This is done by adding a dict like this inside each entry above:
'*': {
  'logdog_only': True,
},

I believe no master restart is needed for this to take effect.