Yes, you can get some logs, although they are not very verbose for the Webhooks. To enable them, you must set the Compute Engine verbosity to DEBUG. Add the following to your $SQ_HOME/conf/sonar.properties file:
sonar.log.level.ce=DEBUG
You can then see the error in $SQ_HOME/logs/ce.log.
It does. And like I said, it’s not very verbose . But at least, it can give you the HTTP status, or a short error description (like “timed out”). Hope this will help you if it ever happens again.