如何从日志文件中打印行组，将它们转换为单行

I am trying to print error logs in my server into a single line with just time and important detail for failure. 1st line contains the time stamp of log and last line above new line contains reason for the log. Wanted to align them into single line. Any help is appreciated. "Need the timestamp , severity, last line just before the blank line" in a single line. I am trying to print error logs in my server in