StackExchange.Exceptional is the name of the error handler used by the Stack Exchange network. Questions using this tag should not be asking about errors within a Stack Exchange member website, but be programming questions about using the open sourced library.
StackExchange.Exceptional is the name of the error handler used for the Stack Exchange network. From the github repository:
StackExchange.Exceptional is the error handler used internally by Stack Exchange and Stack Overflow for logging to SQL (SQL Server and MySQL are both supported).
It also supports JSON and memory error stores, filtering of exceptions before logging, and fail/retry mechanisms for storing errors if there's an interruption in connecting to the error store.
You can find the nuget package here.