Why does rsyslog stop logging locally when the remote log server cannot be reached?

Issue

• Rsyslog stops logging locally when the remote log server cannot be reached
• Rsyslog exhibits performance degradation when remote log server is unreachable
• Rsyslog clients behave erratically when unable to establish TCP connection to remote log server (despite using queues)
• The server rebooted automatically and the vmcore was generated. However no logs around the time of reboot were found.