Looks like by default functions log at the
info level. To change the level you can use set the application setting
AzureFunctionsJobHost__logging__LogLevel__Default to some other value like
If you want to disable adaptive sampling then that can be done in the host.json
In this example adaptive sampling is turned off so you get every log message.
A thing to note is that if you crank down logging to Error you won't see the invocations at all in the portal but they're still running.