Lossy logging, also get some messages after an error?

Question

Lossy logging in log4net is great to get the details of events leading to an error with minimal performance-loss. However it would often be interesting to also log a few messages after the error to verify that the system handled it as planned. How can it be done?

Answer 1

I would write a custom version of the BufferingForwardAppender, which would log a configurable number of message after an error. Basically you turn off "being lossy" after an error for a while and forward all messages directly.

Note: Make sure that the appender flushes the messages immediately when an error is logged because you cannot be sure that there will be other messages after the error.