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New read-only system variables (set at startup, need --log-error): * log_error_file_buffer_size: error log buffer size, default 0 (off) * log_error_file_rotate_size: rotate the error log above this size, default 1073741824 * log_error_file_rotations: number of rotated files kept, default 0 Changes: * Write the error log through the logger service, which batches writes in an in-memory buffer, when log_error_file_buffer_size is set. * print_buffer_to_file() uses one static buffer, allocated on first use (MAX_LOG_BUFFER_SIZE+1), grown as needed and freed at shutdown. * vprint_msg_to_log() writes lines longer than 1024 bytes in full, up to 1 MB. * Galera messages use the same error log path. Debug messages are written only if wsrep_debug is set. * Add mtr tests for the three variables, buffered logging, rotation and long lines. Assisted-by: https://mariadb.org/governance/governance-ai-policy/