What is displayed in the log (console) isnt useful

1

Why does my console (Ruby+Sinatra) display this, instead of the message?

2019-03-09T01:52:23.691057+00:00 app[web.1]: I, [2019-03-09T01:52:23.690955 #4] INFO -- sentry: ** [Raven] Sending event b1a3b5c14db74557a87e903123d17381 to Sentry