many aspects of Knime are really great, but the Console is one thing that I think should be improved in terms of log levels.
For example there are some warnings that are certainly necessary during configuration or testing, but on a production workfllow they are just flooding the console. One example may be the RowId reset for appending columns later on, another is probably getting warned of empty tables even at the Empty Table Switch.
For the Image Processing Plugin (I know, not directly your business) it's getting worse, as it has a few messages that are hinting to expected behaviour but potentially produce a warning for every single line of a table.
Basically I'd like to have a local suppression switch for those, if there's no better alternative.
On the other hand it still happens every now an then that I get an exception stopping my workflow that occurs only rarely, say on the 210th repetition after 5h. My current case is solved by merely re-executing the node a few seconds later. Being hard to reproduce, it is also hard to get a stack trace on those and to file a helpful bug report.
Therefore, my second request is to increase the log level of stack traces to Error, especially if the execution is stopped by that error.