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WebSocket clients going away is an expected and common occurance. Logging at ERROR level on failure to close a connection or on failures to write data to a WebSocket sessions has a high potential for false positives with very little to do. This change lowers the log level for a number of log messages that fit this category. This should be helped by the effort already spent for 4.1 to ensure logging at DEBUG level doesn't produce excessive amounts of logging. Issue: SPR-12155