This counter tallies the number of frames received by the UART that had framing errors, meaning the expected start/stop bit pattern was not detected correctly. A rising count typically points to a baud rate or stop-bits mismatch between the device and the connected terminal, or a marginal serial cable. An admin seeing uartFramingErrors climb would check that uartBaudRate and uartStopBits on the device match the terminal's settings before suspecting the cable itself.